Inventor
HAYASHI TAKETO
JP13 patents
⚠️ This page may combine multiple inventors who share the name “HAYASHI TAKETO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SUMIKA FINE CHEMICALS CO LTD
9 patentsUS5389637AFeb 14, 1995
2-formylamino-6-halogenopurine
SUMIKA FINE CHEMICALS CO LTD6 citations72
US5902899AMay 11, 1999
Process for preparing 1, 3-disubstituted urea
SUMIKA FINE CHEMICALS CO LTD8 citations71
US5508446AApr 16, 1996
Method for producing alkyl 3-phthalidylideneacetate
SUMIKA FINE CHEMICALS CO LTD4 citations61
US6455696B2Sep 24, 2002
Process for preparing 2,6-dichloropurine
SUMIKA FINE CHEMICALS CO LTD5 citations60
US6342603B1Jan 29, 2002
Purine derivatives having cyclopropane ring
SUMIKA FINE CHEMICALS CO LTD4 citations58
US5440037AAug 8, 1995
Method for production of 2-amino-6-halogenopurine derivatives
SUMIKA FINE CHEMICALS CO LTD0 citations51
US5391733AFeb 21, 1995
Synthesis intermediates for 2-amino-6-halogenopurines
SUMIKA FINE CHEMICALS CO LTD0 citations51
US5994541ANov 30, 1999
Process for producing 2-amino-6-iodopurine
SUMIKA FINE CHEMICALS CO LTD0 citations50
US6156892ADec 5, 2000
Purine derivatives having cyclopropane ring
SUMIKA FINE CHEMICALS CO LTD1 citations47
SUMITOMO CHEMICAL CO
4 patentsUS6936713B2Aug 30, 2005
Process for producing 2,6-dihalogenopurine
SUMITOMO CHEMICAL CO7 citations70
US7321035B2Jan 22, 2008
Process for producing 2,6-dihalogenopurine
SUMITOMO CHEMICAL CO0 citations48
US7307167B2Dec 11, 2007
Production method of 2,6-dihalopurine
SUMITOMO CHEMICAL CO1 citations48
US7345170B2Mar 18, 2008
Crystal and solvate of 2-amino-6-benzyloxypurine and production methods thereof
SUMITOMO CHEMICAL CO0 citations47