Filings by year

C04B 41/87: granted patents and published applications per publication year
YearGranted patentsPublished applications
197660
197740
197850
197940
198080
1981120
198280
1983160
1984240
1985230
1986260
1987180
1988190
1989320
1990420
1991450
1992320
1993370
1994360
1995310
1996350
1997400
1998360
1999270
2000210
2001198
20023635
20033334
20042742
20052339
20062139
20072236
20081439
20092647
20102245
20111738
20123033
20133334
20141926
20151626
20162648
20172449
20183051
20193671
20204273
20213790
20224263
20237165
20245798
20256789
20265755

By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.

Recent patents

Most cited

By later US patents