Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 6596838 | Separation method and device with semi-permeable membranes comprising sulphonated polyimides The invention relates to a semi-permeable membrane separation process and device in which the said membranes comprise sulphonated polyimides. The present invention also relates to the use of sulphonated polyimide membranes in separation processes and devices u... | 07/22/2003 |
| 6551467 | Microwave facilitated allyllic substitution The present invention is draw to microwave heating of a transition metal-catalysed organic reaction, in which a catalyst complex between a transition metal and an auxiliary ligand or ligands, the ligand being asymmetric or symmetric, monodentate or bident... | 04/22/2003 |
| 6207025 | Preparation of methane sulfonic acid A process for preparing methanesulfonic acid by irradiating a mixture comprising acetic acid, sulfur dioxide and oxygen with light, wherein the reaction mixture is irradiated with an average cumulative irradiance in the range from 240 to 320 mm of from 0.... | 03/27/2001 |
| 6156163 | Reactant, compound and process for the perfluoroalkylation of the nucleophile, and the derivatives obtained A reagent comprising a compound of formula (I): Rf --M(X) (Z)n --Y--R, wherein R is a hydrocarbon radical advantageously having at most 10 carbon atoms and being selected from alkyls and aryls; Rf is a radical of formula I... | 12/05/2000 |
| 5994110 | Methods for direct synthesis of compounds having complementary structure to a desired molecular entity and use thereof Compounds which possess a complementary structure to a desired molecule, such as a biomolecule, in particular polymeric or oligomeric compounds, which are useful as in vivo or in vitro diagnostic and therapeutic agents are provided. Also, various methods ... | 11/30/1999 |
| 5698830 | Process for the preparation of alkanesulphonic acids The invention relates to the preparation of alkanesulphonic acids by photo-oxidation of dialkyl disulphides. The procedure is carried out in solution in an alcohol using a light source irradiating between 200 and 320 nm.... | 12/16/1997 |
| 5380629 | Method of making and a photographic element containing bleach accelerator silver salts This invention provides a process for preparing a bleach accelerator silver salt dispersion by precipitating a salt of a bleach accelerating compound and a silver salt wherein the vAg is maintained at a predetermined level during the precipitation. This i... | 01/10/1995 |
| 5153352 | Process for preparation of intermediates of carbocyclic nucleoside analogs A compound of the formula: ##STR1## wherein A is a purin-9-yl group, a heterocyclic isostere of a purin-9-yl group, a pyrimidin-1-yl group or a heterocyclic isostere of a pyrimidin-1-yl group; E is hydrogen, --CH2 OH or --OH; and G and D ... | 10/06/1992 |
| 5035782 | Method for the formation of monomolecular adsorption films or built-up films of monomolecular layers using silane compounds having an acetylene or diacetylene bond A method for the formation of monomolecular adsorption films of a silane compound having a diacetylene bond is described. The silane compound is chemically adsorbed on a substrate through .dbd.SiO-- bonds and the resultant film is significantly reduced in... | 07/30/1991 |
| 4997535 | Method of manufacturing methanesulfonyl chloride This invention is concerned with the manufacture of methanesulfonyl chloride from a mixture of methane, sulfur dioxide gas and chloride gas under irradiation of light having a wave length of 200~600 nm from a low vapor pressure mercury lamp, a high vapor ... | 03/05/1991 |
| 4997988 | Oxa-organic sulfur compounds, their preparation and use Oxa-organic sulfur compounds, methods of preparing such compounds and methods of using the compounds as polymer chain length terminating agents are provided. The compounds are prepared by reacting allyl alcohol in the presence of a basic catalyst with a c... | 03/05/1991 |
| 4944853 | Photochemical preparation of 3-(organothio) aldehydes A process is disclosed for the preparation of 3-(organothio)aldehydes by reacting a mercaptan with an , ଲ-unsaturated aliphatic aldehyde under actinic radiation in the absence of an oxygen-containing gas wherein the mercaptan and aldehyde are... | 07/31/1990 |
| 4921589 | Polysiloxane bound photosensitizer for producing singlet oxygen This invention relates to a photosensitizer which is bound to a polysiloxane polymer, a method of preparing the bound photosensitizer and a process for using the bound photosensitizer. The photosensitizers which may be used in the invention include rose b... | 05/01/1990 |
| 4915804 | Titanate bound photosensitizer for producing singlet oxygen This invention relates to a photosensitizer which is bound to a titanate polymer, a method of preparing the bound photosensitizer and a process for using the bound photosensitizer. The photosensitizers which may be used in the invention include rose benga... | 04/10/1990 |
| 4832807 | Phosphorylation of alcohols Phosphorylation of alcohols by contacting the alcohol with a phosphorous sulphide under the impact of ultrasound. The phosporylated produce can be converted into a metal salt, which is a suitable anti-wear additive for lubricating oils.... | 05/23/1989 |
| 4736055 | Oxime sulfonates containing reactive groups Oxime sulfonates of formula I ##STR1## wherein Y is a polymerizable unsaturated group or epoxide group or an --OH, --NHR5, --COOH, COOR6, --COCl, --CH2 Hal, --SO2 Cl or --NCO group, Z is an (x+y)-valent con... | 04/05/1988 |
| 4673474 | Molecular controlled structure and method of producing the same Disclosed is a molecular controlled structure which includes a plurality of normal chain hydrocarbon molecules having at one end an energy responsive group such as a double bonding between carbon atoms as C.dbd.C and having at the other end a reaction gro... | 06/16/1987 |
| 4443310 | Photoinitiated synthesis of mercaptans Improvement in the photoinitiated synthesis of mercaptans, in which an ethylenic compound is treated with hydrogen sulphide, preferably under pressure, in the presence of ultraviolet radiation and a photoinitiator involves the use of a xanthenic compound,... | 04/17/1984 |
| 4391608 | Process for the beneficiation of carbonous materials with the aid of ultrasound A process for reducing the sulfur and ash content of coal and the like by treatment in an aqueous slurry with ultrasound followed by subsequent separating steps.... | 07/05/1983 |
| 4233128 | Photosynthesis of mercaptans Synthesis of mercaptans by the photochemical reaction of an olefin with hydrogen sulphide in the presence of an initiator constituted by benzophenone, thiobenzophenone or a mixture of the two, preferably accompanied by an organic compound of an element of... | 11/11/1980 |
| 4140604 | Process for preparing mercaptans An improvement in the process for preparing mercaptans wherein an ethylenically unsaturated organic compound is reacted with hydrogen sulfide that is present in molar excess, catalyzed by UV light, with recovery of the desired mercaptan from the reaction ... | 02/20/1979 |
| 4082712 | Process for curing sulfhydryl-terminated thioether polymers An improved process for curing sulfhydryl-terminated thioether polymers substantially devoid of aliphatic unsaturation having a sulfhydryl functionality of 2 to 3 to obtain thioether elastomers is disclosed wherein the liquid thioether is reacted with a c... | 04/04/1978 |
| 4059570 | Polythioether polyurethanes and their preparation Novel polythioether polyurethanes of superior thermal and oxidative aging stability are prepared from polythioether dithiols derived from addition of dithiols to acetylenes under free radical conditions. These polythioether dithiols having alkyl branching... | 11/22/1977 |
| 4043886 | Photochemical reactor and irradiation process A photochemical reactor and processes for irradiation of fluid reactants for production of products by radiation catalysis are provided. The reactor is particularly adapted for radiation catalysis of fluids which are substantially opaque to radiation and ... | 08/23/1977 |
| 3992274 | Sensitized production of sulfhydryl compounds using ultra violet radiation An improved process for production of sulfhydryl-terminated compounds by reaction of an allene compound and hydrogen sulfide is disclosed wherein the reaction is carried out in the presence of ultraviolet light of wavelength substantially above 2600 Angst... | 11/16/1976 |
| 3992289 | Method for production of sulfhydryl compounds using ultra-violet radiation An improved process is disclosed for production of sulfhydryl-terminated compounds by reaction of an allene and hydrogen sulfide initiated with ultraviolet light of wavelength above about 2600 Angstroms to obtain a colorless product of improved purity. Th... | 11/16/1976 |
| 3960683 | Process for the desulfurization of light oils A process for the desulfurization of light oils, which comprises irradiat light oils containing sulfur compounds such as mercaptans and sulfides with ultraviolet rays to decompose the sulfur compounds into water-soluble compounds and thereafter, washing ... | 06/01/1976 |
| 3940374 | Synthesis of polythiol polymer intermediates from polyunsaturated hydrocarbons Polythiols having more than two terminal and/or pendant thiol groups per polymer molecule are formed by the free radical catalyzed addition of a monomer system made up of either hydrogen sulfide or a dithiol alone or in combination with an acetylenic comp... | 02/24/1976 |
