Famous Patents
William F. Semple, a dentist, was awarded the first US Patent on chewing gum in 1869. His recipe contained powdered chalk.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 6120595 | Method of producing activated clay for treating aromatic hydrocarbons The present invention provides an activated clay for refining aromatic hydrocarbons such as BTX (benzene, toluene, xylene), etc., satisfying the requirements of both excellent life and excellent side-reaction-preventing property. The activated clay for tr... | 09/19/2000 |
| 6121363 | Crystalline propylene block-copolymer composition for use in automobile parts A crystalline propyleiie block-copolymer composition exhibiting superior flowability upon molding for use in automobile parts, which composition comprises 41 to 71% by weight of a crystalline propylene block-copolymer composed of a propylene homopolymer p... | 09/19/2000 |
| 6083607 | Triangular pyramidal cube corner type retroreflective sheet The present invention relates to a triangular-pyramidal cube-corner retroreflective sheet constituted with triangular-pyramidal cube-corner retroreflective elements useful for signs including traffic signs and construction work signs, license plates of au... | 07/04/2000 |
| 6083577 | Mask protective device In a mask protective device comprising a frame, the size of which is set to surround a mask pattern, and a transparent thin film 12 spread and fixed to the frame to close one opening of the frame, the periphery of the transparent thin film 12 is bonded to... | 07/04/2000 |
| 6071983 | Primer composition and curable composition A curable dental adhesive composition of the type including polymerizable monomer and polymerization initiator may be easily prepared and applied to a tooth surface by using a tool which includes fibrous or sponge material, adapted to fit within a person'... | 06/06/2000 |
| 6063534 | Nitro group-containing naphthoquinone derivatives and photosensitive material using the same for electrophotography A nitro group-containing naphthoquinone derivative represented by the following general formula: ##STR1## wherein R is a monovalent hydrocarbon group having a nitro group, and a ring A may be substituted with a substituent. This compound is a novel s... | 05/16/2000 |
| 6063726 | Catalyst for polymerizing alpha-olefins and process for polymerization The invention relates to a polymerization catalyst for alpha-olefins and a process for polymerizing alpha-olefins. The catalyst comprises a component having a transition metal compound supported on a carrier and an aluminoxane. The carrier may be pre-trea... | 05/16/2000 |
| 6057397 | Rubber composition and process for preparing the same There is provided a silica-containing diene rubber composition superior in resiliene (which is an indication of rolling resistance), at least equal, in tensile strength and abrasion resistance, to carbon black-containing diene rubber compositions, and goo... | 05/02/2000 |
| 6056892 | Method for purifying liquid crystal A process for purifying an anti-ferroelectric liquid crystal or a ferrielectric liquid crystal, which comprises the following steps 1 to 4, step 1: preparing a liquid crystal solution of an anti-ferroelectric liquid crystal or a ferrielectric liquid crystal to... | 05/02/2000 |
| 6051626 | Adhesive composition for dental or surgical treatment An adhesive composition for dental or surgical treatment comprising (A) 2 to 24 parts by weight of an organic boron compound, (B) 0.002 to 0.5 part by weight of a photopolymerization initiator, (C) 75 to 97 parts by weight of a polymerizable monomer mixtu... | 04/18/2000 |
| 6048607 | Porous film of high molecular weight polyolefin and process for producing same The present invention relates to a porous or microporous film of a high molecular weight polyolefin excellent in strength and air-permeability and suitable for use in filtering materials, separators for aqueous electrolyte batteries, separator films for b... | 04/11/2000 |
| 6043325 | Process for olefin polymerization A process for olefin polymerization, including polymerizing or copolymerizing an olefin in the presence of an olefin polymerization catalyst composed of: a fine particle carrier; (A) a transition metal compound of a Group IVB metal of the periodic table, ... | 03/28/2000 |
| 6028134 | Thermoplastic resin composition having laser marking ability A thermoplastic resin composition having laser marking ability, which comprises a thermoplastic resin and at least two kinds of metal oxides, the content of total metal oxides being 0.001 to 10 parts by weight per 100 parts by weight of said thermoplastic... | 02/22/2000 |
| 6019911 | Polycyclic compound, liquid crystal material consisting of the polycyclic compound, liquid crystal composition comprising the liquid crystal material, and liquid crystal element Disclosed is a polycyclic compound represented by the following formula (I): R1 --X1 --[A1 --X2 ]--[A2 --X3 ]--R2 (I) wherein R1 is a (halogenated) alkyl group of 6 to 16 carbon... | 02/01/2000 |
| 6018069 | 2-isoxazoline derivative and process for producing the same and process for producing related derivatives from the same A purified acid addition salt of a (2S, 3S, 5S)-2,5-diamino-1,6-diphenyl-3-hydroxyhexane, e.g., (2S, 3S, 5S)-2-tert-butoxycarbonylamino-3-hydroxy-5-amino-1,6-diphenylhexane, is obtained from its mixture, in an arbitrary ratio, with its (2S, 3S, 5R) s... | 01/25/2000 |
| 6015625 | Adhesive resin composition and laminate made using the same as adhesive layer An adhesive resin composition contains at least a partially or wholly graft-modified -olefin/aromatic vinyl compound random copolymer having a graft quantity of an unsaturated carboxylic acid or its derivative ranging from 0.01 to 30% by weight. A ... | 01/18/2000 |
| 6013741 | Method of terminating gas phase polymerization of olefin, method of initiating the polymerization and apparatus therefor A method of terminating a gas phase polymerization of an olefin to be conducted subsequent to producing a polyolefin by feeding a gaseous olefin into a fluidized bed reactor to polymerize the gaseous olefin while holding solid particles containing a catal... | 01/11/2000 |
| 6007737 | Liquid crystal compositions The first smectic liquid crystal composition of the invention has a voltage gradation parameter L of less than 0.6, said parameter being defined by the equation L=SH /SO with the proviso that: a liquid crystal cell filled with a liqu... | 12/28/1999 |
| 6007760 | Method of producing inflation film, apparatus therefor and molded articles thereof A method of producing an inflation film which includes the steps of melting an ultra-high-molecular-weight polyolefin in an extruder, extruding the molten polyolefin from a screw die, and blowing a gas into a molten tubular film formed by extrusion. An ap... | 12/28/1999 |
| 6004897 | Olefin polymerization catalyst, process for preparing olefin polymer, and olefin polymer The olefin polymerization catalyst of the invention is formed from a Group IVB transition metal compound represented by the following formula (I) and an organoaluminum oxy-compound or a compound which reacts with the transition metal compound to form an i... | 12/21/1999 |
| 6003584 | Mechanism for constant balance Constant balance of a varying load, particularly a window shade or blind, is maintained by providing a lifting force, preferably from a spring, through a mediating mechanism including a variable pitch screw arrangement, such that the mechanical advantage ... | 12/21/1999 |
| 6002042 | Liquid crystal compound A liquid crystal compound represented by the following general formula (1): ##STR1## wherein R is a linear alkyl group having 6 to 12 carbon atoms, X and Y are both a hydrogen atom, or one of them is a hydrogen atom and the other is a fluorine atom, ... | 12/14/1999 |
| 6001278 | Anti-ferroelectric liquid crystal composition Provided are an anti-ferroelectric liquid crystal composition consisting essentially of (a) a swallow-tailed compound of the formula (1), (b) an anti-ferroelectric liquid crystal compound of the formula (2), and (c) a phenyl ester compound of the formula ... | 12/14/1999 |
| 6001941 | Ethylene -olefin copolymer obtained by copolymerizing ethylene with an -olefin An ethylene/-olefin copolymer obtained by copolymerizing ethylene with an -olefin of 3 to 20 carbon atoms in the presence of a catalyst for olefin polymerization comprising an organoaluminum oxy-compound (a) and at least two kinds of transit... | 12/14/1999 |
| 5997836 | Alkali aluminum complex hydroxide carbonate salt, and a process for producing said salt and its uses According to this invention, an amorphous or pseudo-boehmite-type hydrated alumina gel and an alkali metal carbonate or bicarbonate as starting materials are reacted in an aqueous medium to give a method of producing a process for producing an alkali alum... | 12/07/1999 |
| 5998674 | Bromine compound production method Method of producing a bromine compound having an aliphatic unsaturated bond which includes reacting a compound having an aliphatic unsaturated bond represented by the following general formula (1) with bromine: R1 --O--Ar1 --Y--Ar2 | 12/07/1999 |
| 5994494 | Antisettling agent for aqueous paints An antisettling agent for aqueous paints giving excellent settling-preventing properties to aqueous paints is provided. The antisettling agent is produced by the following process: A polyamide, which is obtained by reacting a primary diamine having 2 to 1... | 11/30/1999 |
| 5994558 | 2-isoxazoline derivative and process for producing the same; and process for producing related derivatives from the same The invention provides methods for preparing a 2-isoxazoline compound represented by formula (1) and a 2,5-diamino-1,6-diphenyl-3-hydroxyhexane compound obtainable by reducing the 2-isoxazoline compound and represented by formula (6): ##STR1## w... | 11/30/1999 |
| 5994439 | Vinyl chloride resin composition for powder molding Provided is a vinyl chloride resin composition for powder molding comprising: (1) 100 parts by weight of a vinyl chloride resin powder having an average polymerization degree p of 600 to 3000 and an internal pore volume of 0.20 ml/g or more, (2) 80 to 150... | 11/30/1999 |
| 5990158 | Carboxylic acid derivatives, method of manufacturing the same and therapeutic agents containing these compounds New therapeutic agents of carboxylic acid derivatives are disclosed, which are represented by the compounds of the following formula (I) or its pharmaceutically acceptable salts, ##STR1## These compounds are useful as a matrix metalloproteinases (MMP... | 11/23/1999 |
| 5990204 | Crosslinking isoprene-isobutylene rubber with alkyphenol-formaldehyde and epoxy resins The present invention relates to a method for crosslinking an isoprene-isobutylene rubber with resins, and a crosslinked rubber product obtained by said method. According to the present invention, there are provided: a method for crosslinking an isoprene-... | 11/23/1999 |
| 5990235 | Olefin block copolymer and production process thereof A chemically bonded olefin block copolymer consists essentially of chemically bonded polypropylene and poly(ethylene-co-propylene). The block copolymer is obtained by a process of (1) introducing a Ziegler polymerization catalyst based on titanium and pro... | 11/23/1999 |
| 5990272 | Method of treating polyolefin A method of treating polyolefin comprises (i) a ligand-decomposition step of contacting polyolefin, which is obtained by the use of a transition metal compound containing ligands having cyclopentadienyl skeleton, with a ligand decomposer, such as water, o... | 11/23/1999 |
| 5988821 | Lens type functional retroreflective sheeting and method of producing same This invention relates to lens type functional retroreflective sheeting having retroreflective regions and visual functionality presenting regions, the retroreflective sheeting comprising: a base sheet consisting of a support comprising a functional resin laye... | 11/23/1999 |
| 5989510 | Method of producing granular amorphous silica A method of directly precipitating a spherical amorphous silica in a high yield by adding a carboxymethyl cellulose (CMC) as a coagulation growing agent in a step of neutralizing the alkali silicate with an acid. The CMC having a particular etherification... | 11/23/1999 |
| 5987297 | Image-forming apparatus including a photosensitive material drum and a rubber blade for cleaning toner off of the drum An image-forming apparatus using a rubber blade having a rubber hardness of not smaller than 73° for cleaning the residual toner on the photosensitive material drum, wherein a maximum rotational deviation r (mm) of said photosensitive material drum satis... | 11/16/1999 |
| 5985172 | Racemic compound and anti-ferroelectric liquid crystal composition containing the compound A racemic compound of the formula (1) ##STR1## and an anti-ferroelectric liquid crystal composition consisting essentially of said racemic compound and one anti-ferroelectric liquid crystal compound of the formula (2) or a mixture of two or more comp... | 11/16/1999 |
| 5981408 | Screen textile material A screen textile material for high precision and high density screen printing is made of a core and sheath type conjugate fiber in which a core component is formed of a thermotropic liquid crystalline polyester (A polymer) and a sheath component is formed... | 11/09/1999 |
| 5980780 | Racemic compound and anti-ferroelectric liquid crystal composition containing the compound A racemic compound of the formula (1) ##STR1## and an anti-ferroelectric liquid crystal composition consisting essentially of said racemic compound and one anti-ferroelectric liquid crystal compound of the formula (2) or a mixture of two or more comp... | 11/09/1999 |
| 5976742 | Naphthoquinone derivative and electrophotographic material using the naphthoquinone derivative The present invention provides a novel naphthoquinone derivative preferred as an electron transporting agent and an electrophotographic photosensitive material of high sensitivity which contains a novel naphtoquinone derivative having a general formula (1... | 11/02/1999 |
