IFI
Patent Intelligence & Technology Report
Class Distribution for 1990-1999
525 - SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES
SERIES (IPC C08F, C08L, C08G)
1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 Total
PPG INDUSTRIES INC
3 2 4 2 3 5 11 6 12 4 52
DAIKIN KOGYO CO LTD JP
3 4 1 0 4 2 6 6 1 5 32
WACKER-CHEMIE GMBH DE
2 3 5 1 1 2 3 3 2 4 26
IMPERIAL CHEMICAL INDUSTRIES LTD GB
0 2 1 3 1 3 3 4 2 5 24
SHOWA DENKO K K JP
0 1 4 2 4 2 1 4 3 1 22
IDEMITSU KOSAN CO LTD JP
2 1 3 2 7 1 2 2 0 1 21
HITACHI CHEMICAL CO LTD JP
1 1 3 3 1 3 2 3 0 3 20
DSM N V NL
3 4 1 0 2 4 2 1 0 0 17
CHISSO CORP JP
1 1 1 0 3 0 0 5 3 1 15
MORTON INTERNATIONAL INC
2 2 4 1 1 1 1 1 2 0 15
MASSACHUSETTS, UNIVERSITY OF
2 2 3 1 2 2 0 0 0 0 12
RHONE-POULENC CHIMIE FR
2 2 1 0 0 1 2 1 1 0 10
PENN STATE RESEARCH FOUNDATION THE
1 1 1 1 3 0 0 0 0 0 7
ALBEMARLE CORP
1 3 2 0 0 0 0 0 0 0 6
DEGUSSA DE
0 0 0 0 1 1 2 0 1 1 6
NITTO DENKO CORP JP
0 2 0 0 0 3 1 0 0 0 6
BETZDEARBORN INC
0 1 3 0 0 0 0 0 0 0 4
JOHNSON, S C & SON INC
0 0 0 0 1 0 0 2 1 0 4
SCHERING AG DE
0 0 0 0 0 0 0 3 0 1 4
NATIONAL RESEARCH COUNCIL OF CANADA CA
0 0 0 0 1 1 0 0 1 0 3
PITTSBURGH, UNIVERSITY OF
1 0 1 1 0 0 0 0 0 0 3
FRANCE TELECOM S A FR
0 0 0 1 0 0 0 0 0 0 1
IOWA STATE UNIVERSITY RESEARCH FOUNDATION INC
0 0 0 0 1 0 0 0 0 0 1
NTN CORP JP
0 0 0 1 0 0 0 0 0 0 1
Total 24 32 38 19 36 31 36 41 29 26 312