Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 4507186 | Dianhydrides and polyimides Novel polyimides, copolyimides and molding compositions are prepared from novel dianhydrides such as bicyclo[4.2.0]octane-2,5 diphenyl-7,8-dimethyl,3,4,7,8-tetracarboxylic dianhydride and bicyclo[4.2.0] octane-7,8-dimethyl-3,4,7,8-tetracarboxylic acid ... | 03/26/1985 |
| 4490545 | Cyclic dianhydrides prepared from maleic anhydride Cyclic dianhydrides and polyimides are prepared from maleic anhydride compounds and diolefins. The diolefins are alpha-, omega-linear diolefins of up to 100 carbon atoms or cyclic diolefins of up to 40 carbon atoms. The polyimides and copolyimides prepare... | 12/25/1984 |
| 4481092 | Photo-initiated epoxidation of allyl chloride Epichlorohydrin is prepared by the epoxidation of allyl chloride by a process which comprises irradiating an oxygen-saturated solution of allyl chloride in an aprotic solvent in the presence of an effective amount of an alpha-diketone sensitizer with the ... | 11/06/1984 |
| 4466870 | Organic sonochemistry process The method of causing or promoting chemical changes involving the step of subjecting reactants to ultrasonic energy as a key treatment step, including methods of: (1) reducing aryl halides by treating a mixture of aryl halide and lithium aluminum hydride ... | 08/21/1984 |
| 4428806 | Process for producing brominated 1,3-dioxolen-2-ones A process for producing a brominated 1,3-dioxolen-2-one of the following general formula (I) ##STR1## wherein R1 represents a hydrogen atom, a methyl group, or an aryl group, and R2 represents a hydrogen atom, or R1 a... | 01/31/1984 |
| 4411753 | Synthesis of 6-t-alkyl-3-pyridazinones A class of 6-t-alkyl-3-pyridazinones are prepared from 3-t-alkanoyl-2-propenoic acids by irradiation with strong light and reaction with hydrazine.... | 10/25/1983 |
| 4398033 | 4-Chloro-4-chloromethyloxetan-2-one and a process for its production The new compound 4-chloro-4-chloromethyloxetan-2-one can be prepared by reacting diketene with sulphuryl chloride under conditions in which free radicals are formed. The 4-chloro-4-chloromethyloxetan-2-one exhibits antimicrobial activity. It is also usefu... | 08/09/1983 |
| 4383904 | Photochemical epoxidation This invention provides a process for photochemical epoxidation of olefins with molecular oxygen in a liquid phase with irradiation in the presence of a combination of 1,2-diketone photosensitizers. Propylene can be converted to propylene oxide by reaction wit... | 05/17/1983 |
| 4363923 | 4-Halgeno-oxetan-2-ones and process for their production Novel compounds having the formula I ##STR1## are described wherein X is a chlorine, bromine or iodine atom and Y is a residue having the formula R1 R2 R3 C- wherein R1 and R2 are the same or dif... | 12/14/1982 |
| 4349481 | Tritiated gibberellin aldehydes Is the objective of the invention to develop a process for the production of tagged gibberellin-(7)-aldehydes which is of general applicability. As per the invention a gibberellin-(7)-aldehyde is converted into the gibberellin-(7)-aldehyde tagged at the C... | 09/14/1982 |
| 4345984 | Novel prostaglandin analogues and process for making same A novel process for the oxidation of olefins to the corresponding alpha-epoxy alcohols which can be incorporated in the total synthesis of members of a novel class of prostaglandin analogues. Olefins are reacted with singlet oxygen in the presence of a group I... | 08/24/1982 |
| 4344884 | Process for producing cis-3-(2,2-disubstituted-ethenyl)-2,2-dimethylcyclopropanecarboxylic acid and intermediates Novel intermediates for production of insecticidal cis-3-(2,2-disubstituted-ethenyl)-2,2-dimethylcyclopropanecarboxylates, processes for preparing the intermediates, and processes for preparing the final product insecticides via a novel bicyclic lactone i... | 08/17/1982 |
| 4342694 | Processes for producing pyrethroid insecticide intermediates Processes for producing a (1, 4, 5)-6,6-dimethyl-4-halo-substituted-methyl-3-oxabicyclo[3.1.0]hexan- 2-one and its novel intermediates from known and inexpensive starting materials are described and exemplified. The halomethyl bicyclic... | 08/03/1982 |
| 4324725 | Preparation of 5-(2,2-dihalovinyl)-4,4-dialkyl-tetrahydro-furan-2-ones Preparation of 5-(2,2-dihalovinyl)-4,4-dialkyl-tetrahydro-furan-2-ones of the formula I ##STR1## where R1 and R2 are each alkyl of 1 to 4 carbon atoms and X is halogen, by reacting a carboxylic acid amide of the formula II ... | 04/13/1982 |
| 4320062 | Preparation of 5-(2,2,2-trihaloethyl)-dialkyl-tetrahydrofuran-2-ones Preparation of 5-(2,2,2-trihaloethyl)-4,4-dialkyl-tetrahydro-furan-2-ones of the formula I ##STR1## where R1 and R2 are each alkyl of 1 to 4 carbon atoms and X is halogen, by reacting a carboxylic acid amide of the formula II ... | 03/16/1982 |
| 4318790 | Photochemical process for preparing N-demethyl-derivatives of nogalamycin Photochemical process for preparing N-demethyl-derivatives of nogalamycin.... | 03/09/1982 |
| 4262081 | Fabrication based on radiation sensitive resists of halo-alkyl styrene polymers Radiation sensitive negative resists with requisite stability for dry processing of integrated circuits are polymerized from aromatic moieties containing halogen atoms. Halogen-aryl bridging, generally carbonaceous, increases sensitivity to radiation. Exe... | 04/14/1981 |
| 4255563 | Process for preparing anthocyans from corresponding flavonoid glycosides A process for preparing anthocyans by reducing the corresponding flavonoid glycosides with a metal and acid at temperatures not higher than 30° C. under acidic conditions, precipitating the anthocyans formed from the reduction reaction as a metal salt by... | 03/10/1981 |
| 4235685 | Preparation of 3-thenyl bromide A process for selective bromination of alkyl heterocyclic compounds, such as alkyl thiophenes, by reacting with a brominating agent in a solvent using infrared light as an initiator.... | 11/25/1980 |
| 4233131 | Process for preparing alkylene episulfides and episelenides A process for the preparation of alkylene episulfides or episelenides is provided which comprises contacting elemental sulfur or elemental selenium, respectively, with an olefin, preferably ethylene, while irradiating with electromagnetic radiation in the... | 11/11/1980 |
| 4216153 | Method of preparing phthalide A method has been invented for the preparation of phthalide which comprises chlorinating o-toluic acid at 30°-260° C. and recovering the phthalide obtained.... | 08/05/1980 |
| 4214963 | Process for the preparation of substituted 4H-pyran-4-ones A process for the preparation of a substituted 4H-pyran-4-one is described which consists of reacting a substituted 2,3-dihydro-4H-pyran-4-one with N-bromosuccinimide in the presence of light.... | 07/29/1980 |
| 4211710 | Process of preparing 3-bromophthalide 3-Bromophthalide is produced by reaction of o-toluic acid with bromine or a bromine supplying substance according to the equation: ##STR1##... | 07/08/1980 |
| 4201638 | Triple ions of 1,2- and 1,4-dicarbonyl compounds and analogs thereof containing nitrogen and containing two strategic oxygen or nitrogen groups and process for producing same Stable paramagnetic alkali radical cationic triple ions of selected 1,2 and 1,4 dicarbonyl compounds and their nitrogen-containing analogs have been produced by both conventional alkali metal reduction of an appropriate organic compound and by a novel pro... | 05/06/1980 |
| 4188274 | Process for trifluoromethylation of aromatic and heterocyclic compounds A decarboxylation process for coupling aromatic compounds wherein cyclic hydrocarbons and heterocyclic compounds having at least one labile ring hydrogen are reacted with the mono silver salts of aromatic carboxylic acids, or mono silver salts of unsatura... | 02/12/1980 |
| 4174447 | Process for dimerization, arylation and trifluoromethylation of aromatic and heterocyclic compounds A decarboxylation process for coupling aromatic compounds wherein cyclic hydrocarbons and heterocyclic compounds having at least one labile ring hydrogen are reacted with the mono silver salts of aromatic carboxylic acids, or mono silver salts of unsatura... | 11/13/1979 |
| 4169199 | Precursors for prostaglandin analogue and process for preparing the same Bicyclolactone compounds represented by the formula (I) ##STR1## wherein R1 represents an alkyl group having 1 to 4 carbon atoms, R2 represents a substituted or unsubstituted alkyl group having 1 to 8 carbon atoms and R3 | 09/25/1979 |
| 4154925 | Alkylated derivatives of antibacterial agents cis-BM123γ1 and cis-BM123γ2 This disclosure describes a novel series of potent antibacterial agents designated alkylated-cis-BM123γ1 and alkylated-cis-MB123γ2 produced by a novel photolytic process whereby alkylated-trans-BM123γ1 and alkylate... | 05/15/1979 |
| 4087342 | Method of simultaneously carrying out plurality of photochemical reactions A photochemical reaction system is provided in which a single polychromatic light source is used to simultaneously irradiate a plurality of photochemical reactions with different regions of the spectrum. In this system, the reactions are carried out in se... | 05/02/1978 |
| 4076832 | Cyclodiene insecticides Analogues of dieldrin containing a reduced number of chlorine atoms are described, notably 2,10-syn-bisdechlorodieldrin and 2,3,10-syn-trisdechlorodieldrin. These have varying toxicities towards various insect species but offer the advantage of improved ... | 02/28/1978 |
| 4052277 | Process for preparing perfluorinated ethers Process for preparing perfluorinated ethers by exposing perfluorocarbonyl compounds of the formula ##STR1## wherein R1 and R2 mean identical or different perfluoroalkyl radicals optionally containing one or several ether-like bo... | 10/04/1977 |
| 4052414 | Cis-zearalanone, cis-zearalenol, and cis-zearalene Cis isomers of compounds represented by the formula ##STR1## are prepared by electromagnetic irradiation (about 2800 to 3500 angstroms wavelength) of their respective trans isomers. The cis isomers of the compounds of this invention are of the class ... | 10/04/1977 |
| 4030994 | Substitutive fluorination of organic compounds Organic compounds having at least one replaceable hydrogen atom are fluorinated in the liquid or solid state by treatment with fluoroxyperfluoroalkanes or fluoroxypentafluorosulfur under the influence of a free radical initiator.... | 06/21/1977 |
| 4029616 | Polymer composition of ethylenic compounds and pullulan A polymer composition comprising pullulan and an ethylenic compound is obtained by polymerizing the ethylenic compound in the presence of pullulan and in the presence or absence of a solvent and a catalyst. The polymer compositions are novel composition w... | 06/14/1977 |
| 4011242 | Prostaglandin intermediates and processes for preparation of prostaglandin intermediates Preparation of prostaglandins and certain intermediates therefor wherein a 1,5-diene compound such as ##STR1## IS SUBJECTED TO A PHOTOCHEMICAL CHEMICAL REACTION IN THE PRESENCE OF A PHOTOSENSITIZER WHEREBY TO EFFECT RING CLOSURE WITH THE CONVERSION T... | 03/08/1977 |
| 4004996 | Fluorination of organic compounds Organic amines, amino acids, polyamides and vinylpolymers are fluorinated by the action of fluorine in liquid hydrogen fluoride optionally containing boron trifluoride or antimony pentafluoride at about -80° to 15° C. and optionally under irradiation wi... | 01/25/1977 |
| 4002646 | Process for making tetrahydrofurans Tetrahydrofurans are produced by (a) contacting gamma-chloroalkanols with an aqueous protonic solution by which the chloroalkanol is cyclized to form a tetrahydrofuran and (b) removing the resultant tetrahydrofuran from the reaction mixture. The gamma-chl... | 01/11/1977 |
| 3993664 | Preparation of prostaglandin intermediates Preparation of prostaglandin intermediates by reacting mono-tetrahydropyranyl ether with 3-acetoxy acryloyl chloride in the presence of pyridine to produce the 3-acetoxy acryloyl ester of said ether. The said ester is then irradiated to effect photocycliz... | 11/23/1976 |
| 3973945 | Pyran-2,4-dione derivatives A compound of the formula ##SPC1## Wherein R1 and R2 are alkyl having six or less carbon atoms, R3 is selected from the group consisting of alkyl having six or less carbon atoms and alkenyl having six or less carbon atoms,... | 08/10/1976 |
| 3960899 | Process for the preparation of 8,14-cedranoxide Processes for the preparation of 8,14-cedranoxide are disclosed, according to which 8,14-cedrane diol is prepared by reducing 8,14-cedranolide by treatment with the aid of diisobutyl-aluminum hydride followed by acid hydrolysis, or 8,14-cedrane diol is cy... | 06/01/1976 |
