E04F 21/14
In shafts
Official title: in shafts, e.g. chimneys
E04F21/14 (In shafts) appears on 9 US grants and 1 published applications in this corpus.
Search patents in E04F- Granted patents
- 9
- Published applications
- 1
- Assignees
- 3
- Inventors
- 11
- Latest grant
- 4 Dec 2007
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Method and apparatus for masonry chimney flue repair4 Dec 2007US 7,302,779 B2
- Method and apparatus for spraying grout onto the interior surface of an enclosed elongated cavity26 Sep 1995US 5,452,853 AAction Products Marketing Corporation
- Chimney lining former and compactor8 Nov 1994US 5,362,224 AWorldwide Chimney, Inc.
- Apparatus for patching a break in the sidewall of a chimney2 Aug 1994US 5,333,349 A
- Chiseling apparatus19 Jan 1993US 5,180,210 A
Most cited
By later US patents
- Method and apparatus for spraying grout onto the interior surface of an enclosed elongated cavity41US 5,452,853 AAction Products Marketing Corporation · 1995
- Method of rehabilitating manholes by custom lining/relining37US 5,002,438 A1991
- Apparatus for applying a flowable coating material to the interior of a stack8US 4,253,813 A1981
- Trowel for pipe lining material5US 4,067,680 A1978
- Connecting assembly for pipe lining equipment4US 4,377,984 ASpiniello Construction Company · 1983