Inventor · disambiguated record
Chester J. Opalka, Jr.
Also filed as: OPALKA CHESTER J JR · OPALKA CHESTER JOSEPH · OPALKA JR CHESTER J
29 granted patents·467 citations·filing 1975–1986
97Inventor score
Files withSTERLING DRUG INC29
Top patents by PatentIndex Score
29 records- 0198US4072746A3-Amino-5-(pyridinyl)-2(1H)-pyridinonesSTERLING DRUG INC·Filed 1976·Granted Feb 7, 1978·61 cites·21 claims
- 0297US4309537AProduction of imidazo[4,5-b]pyridin-2-ones or thionesSTERLING DRUG INC·Filed 1981·Granted Jan 5, 1982·53 cites·1 claims
- 0397US4294837A1,3-Dihydro-6-(pyridinyl)-2H-imidazo[4,5-b]pyridin-2-ones and -imidazo[4,5-b]pyridine-2-thiones and their cardiotonic useSTERLING DRUG INC·Filed 1980·Granted Oct 13, 1981·59 cites·12 claims
- 0497US4107315A5-(Pyridinyl)-2(1H)-pyridinonesSTERLING DRUG INC·Filed 1977·Granted Aug 15, 1978·38 cites·15 claims
- 0597US4004012A3-Cyano-5-(pyridinyl)-2(1H)-pyridinonesSTERLING DRUG INC·Filed 1975·Granted Jan 18, 1977·50 cites·5 claims
- 0693US4137233A1,2-Dihydro-2-oxo-5-(pyridinyl)nicotinamidesSTERLING DRUG INC·Filed 1978·Granted Jan 30, 1979·17 cites·3 claims
- 0787US4199586ADi-(lower-alkyl) N-[1,2-dihydro-2-oxo-5-(pyridinyl)-3-pyridinyl]amino-methylanemalonatesSTERLING DRUG INC·Filed 1978·Granted Apr 22, 1980·9 cites·6 claims
- 0886US4225715APreparation of 3-amino(or carbamyl)-5-(pyridinyl)-2(1H)-pyridinonesSTERLING DRUG INC·Filed 1979·Granted Sep 30, 1980·9 cites·9 claims
- 0985US4465686A5-(Hydroxy- and/or amino-phenyl)-6-(lower-alkyl)-2-(1H)-pyridinones, their cardiotonic use and preparationSTERLING DRUG INC·Filed 1982·Granted Aug 14, 1984·17 cites·19 claims
- 1083US4312875A5-(Pyridinyl)-6-(lower-alkyl)-2(1H)-pyridinones, 1,2-dihydro-2-oxo-5-(pyridinyl)-6-(lower-alkyl)nicotinic acids and lower-alkyl esters thereof, and cardiotonic use thereofSTERLING DRUG INC·Filed 1980·Granted Jan 26, 1982·19 cites·18 claims
- 1182US4104385ACyclic alkylidenyl N-[6-(amino)-3-pyridazinyl]aminomethylenemalonatesSTERLING DRUG INC·Filed 1977·Granted Aug 1, 1978·11 cites·18 claims
- 1281US4599423APreparation of 5-(hydroxy- and/or aminophenyl-6-lower-alkyl)-2(1H)-pyridinonesSTERLING DRUG INC·Filed 1984·Granted Jul 8, 1986·13 cites·8 claims
- 1381US4276293ACompositions and their preparationSTERLING DRUG INC·Filed 1980·Granted Jun 30, 1981·20 cites·10 claims
- 1480US4391811A2-Amino-6-(pyridinyl)-3H-imidazo[4,5-b]pyridines and their cardiotonic useSTERLING DRUG INC·Filed 1981·Granted Jul 5, 1983·11 cites·10 claims
- 1578US4223149AProcess for producing 3-cyano-5-(pyridinyl)-2(1H)-pyridinonesSTERLING DRUG INC·Filed 1979·Granted Sep 16, 1980·8 cites·5 claims
- 1677US4297360A5-(Pyridinyl)pyridine-2,3-diamines, preparation thereof and their cardiotonic useSTERLING DRUG INC·Filed 1980·Granted Oct 27, 1981·13 cites·14 claims
- 1775US4225601A3-Hydroxy or hydroxymethyl-5-(4-pyridinyl)2(1H)-pyridinones, useful as cardiotonic agents and their preparationSTERLING DRUG INC·Filed 1979·Granted Sep 30, 1980·11 cites·9 claims
- 1866US4271168ASelected 3-acylamino-5-[4(or 3)-pyridinyl]-2(1H)-pyridinonesSTERLING DRUG INC·Filed 1979·Granted Jun 2, 1981·7 cites·10 claims
- 1961US4374141A2-Substituted amino-5-(pyridinyl)-nicotinamides and their cardiotonic useSTERLING DRUG INC·Filed 1981·Granted Feb 15, 1983·4 cites·11 claims
- 2061US4362734A2-(Substituted-amino)-5-(pyridinyl-nicotinonitriles, and their cardiotonic useSTERLING DRUG INC·Filed 1981·Granted Dec 7, 1982·4 cites·12 claims
- 2157US4684636AAntiandrogenic sulfonylsteroidopyrazoles and processes for preparation method of use and compositions thereofSTERLING DRUG INC·Filed 1986·Granted Aug 4, 1987·10 cites·19 claims
- 2257US4559352A1,2-Dihydro-2-oxo-5-(hydroxy-and/or amino-phenyl)-nicotinonitriles and cardiotonic use thereofSTERLING DRUG INC·Filed 1984·Granted Dec 17, 1985·3 cites·12 claims
- 2357US4515797A3-Amino-5-(hydroxy- and/or aminophenyl)-6-(lower-alkyl)-2(1H)-pyridinones and cardiotonic use thereofSTERLING DRUG INC·Filed 1982·Granted May 7, 1985·3 cites·13 claims
- 2456US4463008A2-Alkoxy-5-(pyridinyl)pyridines and cardiotonic use thereofSTERLING DRUG INC·Filed 1982·Granted Jul 31, 1984·5 cites·9 claims
- 2556US4331672A5-(Pyridinyl)pyridine-2-hydrazines, their preparation and their cardiotonic useSTERLING DRUG INC·Filed 1981·Granted May 25, 1982·3 cites·14 claims
- 2651US4420617A5(Pyridinyl)pyridin-2-aminesSTERLING DRUG INC·Filed 1982·Granted Dec 13, 1983·2 cites·5 claims
- 2748US4755595AEnhanced production of 4,5-unsaturated steroids utilizing methanol solvationSTERLING DRUG INC·Filed 1985·Granted Jul 5, 1988·6 cites·4 claims
- 2836US4264609AN-[3-Dimethylamino-2-(4-pyridinyl)-2-propenylidene]-N-methylmethaniminium chloride hydrochloride, its use in preparing 5-(cyano or carbamyl)-[3,4'-bipyridin]-6(1H)-one and its use as a cardiotonicSTERLING DRUG INC·Filed 1980·Granted Apr 28, 1981·1 cites·14 claims
- 2934US4351941APyridinyl-pyridinesSTERLING DRUG INC·Filed 1981·Granted Sep 28, 1982·0 cites·4 claims
Join the waitlist — get patent alerts
Get an alert when Chester J. Opalka, Jr. files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →