Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 7344662 | Reverse synthetic methods for making organic non-linear optical materials A reverse synthetic strategy for making organic non-linear optical chromophores involves building up the chromophore from the electron-withdrawing end toward the electron-donating end. ... | 03/18/2008 |
| 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 |
| 5760249 | Synthesis of hydroxysulfone and related compounds This invention is concerned with an improved process for the synthesis of hydroxysulfone, which is a key intermediate in the synthesis of carbonic anhydrase inhibitors, especially dorzolamide. Carbonic anhydrase inhibitors are known to be effective in tre... | 06/02/1998 |
| 5489590 | Method of treating with therapeutic composition comprising photoactive compound A therapeutic composition derived from a pre-activated photoactive compound and a conveyor for destroying tumor or other pathogenic biological contaminants infecting animal body tissues. The conveyor can either be a matrix support or an antibody. The acti... | 02/06/1996 |
| 5366597 | Process for the preparation of perfluorobutylsulphonyl fluoride The invention relates to a process for the preparation of perfluorobutylsulphonyl fluoride by electrochemical fluorination of butylsulphonyl fluoride, tetrahydrothiophene-1,1-dioxide (sulpholane), 2,5-dihydrothiophene-1,1-dioxide (sulpholene) or mixtures ... | 11/22/1994 |
| 5320784 | Crystal comprising an indolinospirobenzothiopyran derivative and its ring opened isomer The object of this invention is to provide a novel compound suited for use as a piezochromic material. This invention relates to a crystal comprising an indolinospirobenzothiopyran derivative of the following general formula and its ring opened isomer. ... | 06/14/1994 |
| 5177073 | Therapeutic compositions derived from photoactive compounds A therapeutic composition derived from a pre-activated photoactive compound and a conveyor for destroying tumor or other pathogenic biological contaminants infecting animal body tissues. The conveyor can either be a matrix support or an antibody. The acti... | 01/05/1993 |
| 4888100 | Photochemical conversion of cephalosporins, 1-carba(1-dethia)cephalosporins and 1-oxa(1-dethia)cephalosporins A process for photochemically converting 3-exomethylene cephams (or 1-carba(1-dethia)cephams or and 1-oxa(1-dethia)cephams) from the corresponding 3-alkyl-3-cephem (or 1-carba(1-dethia)cephem or 1-oxa(1-dethia)cephem) is provided. Further provided are 3-c... | 12/19/1989 |
| 4851094 | Process for producing amidine sulfonic acid intermediates for guanidines An efficient synthesis of quanidines, e.g. of the formula (III), by oxidizing a thiourea, e.g. of the following formula (II): ##STR1## with H2 O2 and a molybdenum catalyst to yield an aminoiminomethane sulfonic acid which can th... | 07/25/1989 |
| 4845166 | Compositions containing a mixture of a polyhydric alcohol and charge transfer complex of irradiated anhydrides and cyclic ethers, used to cure epoxy resins A curing agent is made by admixing (a) an irradiated mixture of carboxylic acid anhydride and carbon containing cyclic compound and (b) a polyhhydric alcohol, where the curing agent can be added to a resin such as an epoxy resin, applied to the surface of... | 07/04/1989 |
| 4769430 | Polypyrrole thiophene Disclosed are a five-membered heterocyclic compound polymer substantially constituted of repeat units represented by the following general formula: ##STR1## and a process for preparing the five-membered heterocyclic compound polymer described above b... | 09/06/1988 |
| 4695627 | Cephalosporin deoxygenation process A process for the preparation of 7ଲ-acylamino-3-substituted-3-cephem-4-carboxylic acid compounds comprising reacting at -70° C. to 0° C. in an inert organic solvent phosphorus pentachloride with a cephalosporin compound in the presence of an ... | 09/22/1987 |
| 4647348 | Method for production of film-coated silicon semiconductor electrode On a silicon semiconductor or a silicon semiconductor having a coating of a noble metal, a polymer film is deposited by immersing the silicon semiconductor or the silicon semiconductor with the noble metal coating in a solution containing a thiophene comp... | 03/03/1987 |
| 4432847 | Poly sulfoxides from 1,3,4-thiadiazole-2,5-dithiol Poly sulfoxides of the general formula ##STR1## where each R is a monovalent aliphatic radical bound to a sulfoxy group. Each R is defined as being individually selected from the group consisting of ##STR2## wherein R', R" and R"' are indiv... | 02/21/1984 |
| 4375397 | Process for preparing 3-methylene cephalosporins Photolysis of azetidin-2-one derivatives having the formula ##STR1## wherein R1 is acyl, R2 is hydrogen or -methoxy, R3 is hydrogen, alkyl, 2,2,2-trichloroethyl, trimethylsilyl, diphenylmethyl, benzyl, 4-methox... | 03/01/1983 |
| 4311572 | Process for preparing substituted 2-imino-4-dihalomethylene 1,3-dithiolane compounds which are useful as herbicidal antidotes 2-Imino-4-dichloromethylene-1,3-dithiolane and its derivatives may be prepared by cyclizing, via photolysis, an appropriate 2,3,3-trihaloalkyl N-substituted dithiocarbamate in the presence of a suitable solvent, as for example, carbon tetrachloride. The 1... | 01/19/1982 |
| 4287349 | Beta-alkyl (or aryl) beta-hydroxyethyl heterocyclic sulfoxides Beta-alkyl (or aryl) beta-hydroxyethyl heterocyclic sulfoxides are prepared by reacting an olefin and 2-mercaptobenzothiazole with oxygen in the presence of a dye sensitizer using visible light as an energy source at a temperature from -10° to 70° C.... | 09/01/1981 |
| 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 |
| 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 |
| 4113591 | Preparation of cephalosporin compounds The invention relates to a novel method for the preparation of a 7ଲ-acylamido-3-bromomethylceph-3-em-4-carboxylic acid-1-oxide compound by brominating a 7ଲ-acylamido-3-methylceph-3-em-4-carboxylic acid-1-oxide compound.... | 09/12/1978 |
| 4093625 | 6-Sulfur analogs of penicillins and cephalosporins Sulfur analogs of 6-aminopenicillanic acid and biologically active derivatives thereof are formed in a photochemical reaction of the esters of 6-diazopenicillanic acid with thiol compounds. Sulfur analogs of 7-aminocephalosporanic acid and biologically ac... | 06/06/1978 |
| 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 |
| 4066775 | Certain fungitoxic 2-halo-5-trichloromethyl-1,3,4-thiadiazoles This invention relates to new and valuable 2-halo-5-trichloromethyl-1,3,4-thiadiazoles having a good fungicidal action, fungicides containing these compounds as active ingredients, a method of controlling fungi with these compounds, and a process for thei... | 01/03/1978 |
| 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 |
| 4018776 | Process for the preparation of cephalosporins from the corresponding azetidinone-thiazoline derivatives A process is disclosed for preparing a cephalosporin of structure: ##STR1## where R is selected from the class consisting of hydrogen, alkyl having from 1 to 4 carbon atoms, cyano-methyl, thienyl-methyl, furyl-methyl, naphthyl-methyl, phenyl-methyl, ... | 04/19/1977 |
| 4004572 | Solar energy collection and retrieval employing reversible photochemical isomerization A process for photochemical collection, storage, and retrieval of solar energy, including solar energy in the visible and near-infrared light spectrum, comprising: exposing to solar radiation of a trans-isomer of particular geometrically isomerizable comp... | 01/25/1977 |
| 3947336 | Halogenation of heterocyclic compounds A process is described for making thiophens and furans substituted by bromo aliphatic or alaromatic groups by brominating the corresponding aliphatic or alaromatic substituted thiophen or furan by a process comprising gradually adding bromine to an organi... | 03/30/1976 |
