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 |
| 4957912 | 7 acylamidocarbacephem antibacterial agents Novel antibiotics of the formula: ##STR1## and its salts, esters and amides wherein R is acyl; B is H, OMe, Me or SR wherein R is lower alkyl or aryl; A1 is hydrogen, hydroxy, or an organic group; and, X is a divalent radical selected from --O--, --... | 09/18/1990 |
| 4952690 | 6-substituted thia-aza compounds The invention relates to azetidin-2-ones of the formula ##STR1## wherein Ra represents hydroxy-lower alkyl, R1 represents hydrogen, an organic radical bonded by a carbon atom to the ring carbon atom or an etherified mercapto gro... | 08/28/1990 |
| 4912224 | Carboxyalkenamidocephalosporins An antibacterial 7beta-(carboxyalkenoyl)amino-3-cephem-4-carboxylic acid represented by the following formula: ##STR1## (wherein R is aryl or a heterocyclic group; R1 is hydrogen or halogen; R2 is a single bond, alkylene, or thiaalky... | 03/27/1990 |
| 4853468 | Process for the preparation of cephem derivatives This invention provides azetidinone derivatives represented by the formula ##STR1## and processes for preparing the same. The azetidinone derivatives are used as the intermediates for producing cephalosporin compounds useful as antibiotic agents.... | 08/01/1989 |
| 4822790 | 1-Sulfo-2-oxoazetidine derivatives and their production Disclosed are compounds of the general formula: ##STR1## wherein R1 is amino, an acylated amino or a protected amino group, X is hydrogen or methoxy, and R' is hydrogen, R or R4 where R is an organic residue attached to the azet... | 04/18/1989 |
| 4820815 | Azetidinone N-phosphonomethyl esters The invention provides azetidinones of the formula ##STR1## where R4 is hydrogen, amino or protected amino; R0 is H when R4 is amino or protected amino, or C1 -C4 alkyl when R4 is H; R... | 04/11/1989 |
| 4798828 | Heterocyclic-methylene-penems Compounds of the general formula I: ##STR1## and their pharmaceutically acceptable salts and in vivo hydrolyzable esters, in which one of R1 and R2 denotes hydrogen, the other of R1 and R2 denotes an unsubstitut... | 01/17/1989 |
| 4794109 | 6-hydroxy-lower alkylpenem compounds, pharmaceutical preparations that contain these compounds, and the use of the latter 2-Heterocyclyl-lower alkyl-6-hydroxy-lower alkyl-2-penem compounds of the formula ##STR1## in which R1 represents lower alkyl substituted by hydroxy or protected hydroxy, R2 represents carboxy or functionally modified carbo... | 12/27/1988 |
| 4784734 | Azetidinone derivatives and process for the preparation of the same This invention provides azetidinone derivatives represented by the formula ##STR1## and processes for preparing the same. The azetidinone derivatives are used as the intermediates for producing cephalosporin compounds useful as antibiotic agents.... | 11/15/1988 |
| 4775670 | 2-oxo-1-azetidinesulfonic acid salts Antibacterial activity is exhibited by ଲ-lactams having a sulfonic acid salt substituent in the 1-position and an amino or acylamino substituent in the 3-position.... | 10/04/1988 |
| 4775669 | 1-carba-2-penem-3-carboxylic acid Disclosed are 1-carba-2-penem-3-carboxylic acids of the following structure: ##STR1## wherein R1, R2 and R3 are, inter alia, independently selected from the group consisting of hydrogen, alkyl, aryl, and aralkyl. ... | 10/04/1988 |
| 4761408 | Crystalline aminomethyl compound The invention relates to (5R,6S)-2-aminomethyl-6-[(1R)-1-hydroxyethyl]-2-penem-3-carboxylic acid in crystalline form and a process for the manufacture thereof. The substance is suitable for treating infectious diseases.... | 08/02/1988 |
| 4748170 | Carboxyalkenamidocephalosporins An antibacterial 7beta-(carboxyalkenoyl)amino-3-cephem-4-carboxylic acid represented by the following formula: ##STR1## (wherein R is aryl or a heterocyclic group; R1 is hydrogen or halogen; R2 is a single bond, alkylene, or thi... | 05/31/1988 |
| 4743598 | Antibacterial 2-(azacycloalkyl) penems Disclosed are 6-(1'hydroxyethyl)-2-(azacycloalkyl)penem-3-carboxylic acids and salts or metabolizable esters thereof having an absolute stereochemistry of 5R,6S,8R. The compounds are useful and potent antibacterial agents and can be formulated into a vari... | 05/10/1988 |
| 4742052 | Antibacterial ଲ-lactam compounds Novel ଲ-lactam compounds classified into penem compounds, a process for preparing the same and use of such ଲ-lactam compounds are disclosed. These ଲ-lactam compounds exhibit excellent antimicrobial activities useful as pharmaceuticals or... | 05/03/1988 |
| 4740507 | Carbapenem compounds and use Compounds of formula (I): ##STR1## (wherein R1 is carboxy, --CONR4 R5, cyano or hydroxymethyl, and R2 and R3 are hydrogen, alkyl or substituted alkyl, R4 and R5 being hydrog... | 04/26/1988 |
| 4729993 | Carbapenems and 1-methylcarbapenems having an externally alkylated mono- or bicyclic 2-quaternary heteroarylalkyl substituent Carbapenems having the formula: ##STR1## wherein ##STR2## is mono- or bicyclic quaternary heteroaryl, their preparation and antibiotic use are disclosed.... | 03/08/1988 |
| 4723002 | 1-(substituted phosphorous)-azetidinone antibacterials Antibacterial activity is exhibited by 2-azetidinones having an acylamino substituent in the 3-position and having an activating group in the 1-position of the formula ##STR1##... | 02/02/1988 |
| 4716155 | Phosphorus containing compounds and hypotensive use thereof Phosphorus containing compounds of the formula ##STR1## wherein X is a substituted or unsubstituted imino or amino acid and A is ##STR2## These compounds possess angiotensin converting enzyme activity and are thus useful as hypertensive agents.... | 12/29/1987 |
| 4704385 | 3-formamido azetidinone antibacterial agents, their preparation and use A monocyclic ଲ-lactam antibiotic having a formamido substituent at the 3S-position, including compounds of the formula (I): ##STR1## and salts thereof wherein R is --SO3 H; --PO(OH)Y wherein Y is C1-6 alkoxy, hydroxy, aryl... | 11/03/1987 |
| 4692442 | 6-substituted penem compounds The invention relates to 2-penem-3-carboxylic acid compounds of the formula ##STR1## in which Ra represents an organic radical bonded by a carbon atom to the ring carbon atom, a free, etherified or esterified hydroxy or mercapto group or a... | 09/08/1987 |
| 4689411 | 4-thio azetidinone intermediates and process for the preparation of the same This invention provides azetidinone derivatives represented by the formula ##STR1## and processes for preparing the same. The azetidinone derivatives are used as the intermediates for producing cephalosporin compounds useful as antibiotic agents.... | 08/25/1987 |
| 4686298 | Intermediates for alpha-acyloxy phosphonate angiotensin converting enzyme inhibitors Compounds of the formula ##STR1## are useful in the preparation of -acyloxy phosphonate compounds. The final products are useful as anti-hypertensive agents due to their angiotensin converting enzyme inhibition activity.... | 08/11/1987 |
| 4683226 | 6-hydroxyalkyl-2-(substituted-thio)penem-3-carboxylic acids 6-substituted-hydrocarbon-2-(substituted-thio)penem-3-carboxylic acids and cogeners having useful antibacterial activity are disclosed. The compounds are prepared in a reaction sequence starting with a 4-acyloxy-2-azetidinone.... | 07/28/1987 |
| 4681937 | 3-acylamino-2-oxo-1-azetidinyl esters of phosphonic acids, phosphoric acid and phosphoric acid esters Antimicrobial activity is exhibited by ଲ-lactams having a ##STR1## substituent in the 1-position and an acylamino substituent in the 3-position, or a pharmaceutically acceptable salt thereof; wherein Y is oxygen or sulfur and R5 is h... | 07/21/1987 |
| 4678782 | 3S-formamido azetidinone antibacterial agents, their preparation and use A monocyclic ଲ-lactam antibiotic having a formamido substitutent at the 3S-position, including compounds of the formula (I): ##STR1## and salts thereof wherein R is --SO3 H; --PO(OH)Y wherein Y is C1-6 alkoxy, hydroxy, ary... | 07/07/1987 |
| 4670554 | ((3-Acylamino-2-oxo-1-azetidinyl)oxy)methyl)phosphinic acids Antibacterial activity is exhibited by ଲ-lactams having a 3-acylamino substituent and in the 1-position a substituent having the formula ##STR1## wherein R5 and R6 are the same or different and each is hydrogen, alkyl, alk... | 06/02/1987 |
| 4670422 | -acyloxy phosphonate angiotensin converting enzyme inhibitors Compounds of the formula ##STR1## wherein X is various amino or imino acids and esters are disclosed. These compounds are useful as anti-hypertensive agents due to their angiotensin converting enzyme inhibition activity and depending upon the definit... | 06/02/1987 |
| 4663450 | Optically active cephalosporin analogs Optically active cephalosporin analogs of the formula ##STR1## wherein R2 represents a hydrogen or a group represented by the formula ##STR2## wherein R3 is a straight or branched lower alkyl group having 1 to 6 carbon... | 05/05/1987 |
| 4659814 | Salts of amino-beta-lactamic acids and process for the preparation thereof Amino-beta-lactamic acid salts, having the formula: ##STR1## wherein: (X-Y) may form a system having from 1 to 3 carbon atoms, with or without double bond, (a) closed, in which: X is an atom selected from among carbon, oxygen, nitrogen and sulphur; Y... | 04/21/1987 |
| 4656165 | Aminomethyl penem compounds Compounds of the formula ##STR1## in which R1 is lower alkyl substituted by hydroxy or by protected hydroxy, R2 represents carboxy or functionally modified carboxy, and R3 represents amino, lower alkyl-substituted amino, s... | 04/07/1987 |
| 4647558 | Antibacterial agents, their preparation and use A monocyclic ଲ-lactam antibiotic having a formamido substituent at the 3S-position, including compounds of the formula (I): ##STR1## and salts thereof wherein R is --SO3 H; --PO(OH)Y wherein Y is C1-6 alkoxy, hydroxy, aryl... | 03/03/1987 |
| 4634697 | Carboxyalkenamidocephalosporins An antibacterial 7beta-(carboxyalkenoyl)amino-3-cephem-4-carboxylic acid represented by the following formula: ##STR1## (wherein R is aryl or a heterocyclic group; R1 is hydrogen or halogen; R2 is a single bond, alkylene, or thiaalky... | 01/06/1987 |
| 4629726 | Penem carboxylic acids A 2-substituted or unsubstituted-6-(2-oxo-1, 3-dioxolan-4-yl)-2-penem-3-carboxylic acid derivative represented by the following formula (Ia) and: ##STR1## wherein R is hydrogen, a light metal or a carboxy-protecting group, R1 is an al... | 12/16/1986 |
| 4625022 | Process for preparing (s)-3-amino-2-oxo-1-azetidinesulfonic acid salts The process of this invention provides for the conversion of amino acid amides having the formula ##STR1## to 3-amino-2-oxo-1-azetidinesulfonic acid salts having the formula ##STR2## wherein one of R2 and R3 is hydrogen and... | 11/25/1986 |
| 4617300 | 2(N-heterocyclyl) penems There are disclosed 2(N-heterocyclyl) penems and their pharmaceutically acceptable salts and esters and their use as anti-bacterials.... | 10/14/1986 |
| 4616007 | Heterocyclthio compounds, process for their manufacture, pharmaceutical preparations that contain these compounds, and the the use of the latter 2-heterocyclythio-lower alkyl-2-penem compounds of the formula ##STR1## in which R1 represents hydrogen or methyl, R2 represents an optionally protected hydroxy group, R3 represents carboxy or protected carboxy R... | 10/07/1986 |
| 4600713 | 1-, 6- and 2-substituted-1-carba-2-penem-3-carboxylic acids Disclosed are 1-, 6- and 2-substituted-1-carba-2-penem-3-carboxylic acids of the following structure: ##STR1## wherein R1, R2, R3, R4 and R5 are, inter alia, independently selected from the group... | 07/15/1986 |
| 4592865 | Azetidinone intermediates for cephalosporin analogs Intermediates of the following formula are useful for the synthesis of 1-oxacephalosporins. Their preparation from penicillins and the transformation process to make 1-oxacephalosporins are disclosed. The compounds are of the formula: ##STR1## w... | 06/03/1986 |
| 4584132 | 1-(N-phosphinylcarbamoyl) ଲ-lactam antibacterial agents A novel family of ଲ-lactam antibacterials, synthetic methods and intermediates useful in the production of such antibacterials, and the use of such compounds as antibacterials are disclosed. The novel compounds have the formula ##STR1## wh... | 04/22/1986 |
