Inventor · disambiguated record
Derek Walker
Also filed as: JOHNSON DAVID A · WALKER DEREK · WALKER DEREK W R
35 granted patents·2 pending applications·256 citations·filing 1973–2020
97Inventor score
Files withBRISTOL MYERS CO16GLAXO LAB LTD6A W HAINSWORTH & SONS LTD3SCHERING CORP3YORKSHIRE IMPERIAL PLASTICS3
Top patents by PatentIndex Score
37 records- 0188US6955193B2Fire resistant textile materialA W HAINSWORTH & SONS LTD·Filed 2001·Granted Oct 18, 2005·24 cites·20 claims
- 0287US4347354APreparation of 1-N-[ω-amino-α-hydroxyalkanoyl]aminoglycoside polysilylated antibiotics and products obtained therefromBRISTOL MYERS CO·Filed 1980·Granted Aug 31, 1982·44 cites·30 claims
- 0382US4424343APreparation of 1-N- ω-amino-α-hydroxyalkanoyl!kanamycin polysilylates and productsBRISTOL MYERS CO·Filed 1980·Granted Jan 3, 1984·28 cites·21 claims
- 0479US4223135AProduction of cephalosporinsBRISTOL MYERS CO·Filed 1979·Granted Sep 16, 1980·10 cites·20 claims
- 0575US4038469AAqueous insoluble polymers containing a plurality of diazomethylene groupsGLAXO LAB LTD·Filed 1974·Granted Jul 26, 1977·17 cites·5 claims
- 0672US4176131AChemical processBRISTOL MYERS CO·Filed 1978·Granted Nov 27, 1979·8 cites·10 claims
- 0768US6699802B1Fire resistant textile materialA W HAINSWORTH & SONS LTD·Filed 2000·Granted Mar 2, 2004·21 cites·12 claims
- 0866US4059573AExtraction of N-blocked amino acids from aqueous mediaGLAXO LAB LTD·Filed 1976·Granted Nov 22, 1977·5 cites·14 claims
- 0965US4340344AApparatus for manufacture of thermoplastics pipeYORKSHIRE IMPERIAL PLASTICS·Filed 1980·Granted Jul 20, 1982·27 cites·10 claims
- 1065US4310459AProcess for producing carbamoyl substituted penams and carbamoyl substituted cephams from penicillin sulfoxide estersBRISTOL MYERS CO·Filed 1979·Granted Jan 12, 1982·5 cites·106 claims
- 1161US4351766AProduction of penicillinsBRISTOL MYERS CO·Filed 1981·Granted Sep 28, 1982·5 cites·8 claims
- 1255US5660711AProcess for the preparation of intermediates useful in the synthesis of cephalosporinsSCHERING CORP·Filed 1995·Granted Aug 26, 1997·5 cites·18 claims
- 1355US4076913ASolid or gel polymers containing a plurality of free hydrazone groupsGLAXO LAB LTD·Filed 1976·Granted Feb 28, 1978·9 cites·8 claims
- 1454US4374982ACepham compoundsBRISTOL MYERS CO·Filed 1981·Granted Feb 22, 1983·3 cites·3 claims
- 1554US4083837AOxidation of hydrazones to the corresponding diazo compoundGLAXO LAB LTD·Filed 1976·Granted Apr 11, 1978·4 cites·13 claims
- 1648US4634322AAssembly for use in removing material from the ends of bars or the like workpiecesWALKER DEREK W R·Filed 1984·Granted Jan 6, 1987·9 cites·8 claims
- 1748US4518773A"3-Carbamoyloxy cephalosporins"BRISTOL MYERS CO·Filed 1983·Granted May 21, 1985·2 cites·1 claims
- 1846US12152320B2Fire resistant textile materialAW HAINSWORTH AND SONS LTD·Filed 2020·Granted Nov 26, 2024·0 cites·21 claims
- 1946US4426520A3-Carbamoyloxy-cepham-4-carboxylic acid derivativesBRISTOL MYERS CO·Filed 1981·Granted Jan 17, 1984·2 cites·7 claims
- 2045US4316017ACephalosporin intermediatesBRISTOL MYERS CO·Filed 1980·Granted Feb 16, 1982·2 cites·3 claims
- 2144US4322347A2-Carbamoyloxymethyl-penicillin derivativesBRISTOL MYERS CO·Filed 1978·Granted Mar 30, 1982·6 cites·7 claims
- 2244US4240960ATrimethylsilyl substituted penicillinsBRISTOL MYERS CO·Filed 1979·Granted Dec 23, 1980·1 cites·8 claims
- 2342US5571910AProcess for the preparation of intermediates useful in the synthesis of cephalosporinsSCHERING CORP·Filed 1995·Granted Nov 5, 1996·4 cites·2 claims
- 2442US4316016ACephalosporin intermediatesBRISTOL MYERS CO·Filed 1980·Granted Feb 16, 1982·1 cites·8 claims
- 2542US2021010172A1Fire resistant textile materialA W HAINSWORTH & SONS LTD·Filed 2019·Application pending·0 cites
- 2639US4813114AMachining the ends of round bar and tube and similiar workpiecesLUCAS IND PLC·Filed 1987·Granted Mar 21, 1989·6 cites·9 claims
- 2738US2004044225A1Chiral and achiral synthesis of 2-acyl substituted chromanes and their derivativesFiled 2001·Application pending·0 cites
- 2837US6855833B2Methods for producing amino substituted chromanes and intermediates thereofMILLENNIUM PHARM INC·Filed 2001·Granted Feb 15, 2005·0 cites·21 claims
- 2933US4790061AMachining the ends of lengths of wire and bar and similar workpiecesWALKER DEREK W R·Filed 1987·Granted Dec 13, 1988·4 cites·10 claims
- 3033US4407755A6-Amino penam derivativesBRISTOL MYERS CO·Filed 1981·Granted Oct 4, 1983·0 cites·4 claims
- 3132US4310458AProduction of penicillinsBRISTOL MYERS CO·Filed 1979·Granted Jan 12, 1982·0 cites·11 claims
- 3232US4278600AProduction of penicillinsBRISTOL MYERS CO·Filed 1979·Granted Jul 14, 1981·0 cites·18 claims
- 3329US5847116AProcess for the preparation of intermediates useful in the synthesis of cephalosporinsSCHERING CORP·Filed 1996·Granted Dec 8, 1998·0 cites·6 claims
- 3428US4323535AManufacture of thermoplastics pipeYORKSHIRE IMPERIAL PLASTICS·Filed 1980·Granted Apr 6, 1982·3 cites·10 claims
- 3528US4067858AAcid derivative immobilized cephalosporin carboxylic carrying polymerGLAXO LAB LTD·Filed 1974·Granted Jan 10, 1978·0 cites·12 claims
- 3627US3960843AProcess for the preparation of esters of N-blocked penicillin acids which comprises reacting the acid or a salt thereof with a primary amine and a nitrosating agentGLAXO LAB LTD·Filed 1973·Granted Jun 1, 1976·0 cites·6 claims
- 3726US4318681AManufacture of thermoplastics pipeYORKSHIRE IMPERIAL PLASTICS·Filed 1980·Granted Mar 9, 1982·1 cites·10 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →