A01B 3/421
With a headstock frame made in one piece
Official title: with a headstock frame made in one piece
A01B3/421 (With a headstock frame made in one piece) appears on 13 US grants and 0 published applications in this corpus.
Search patents in A01B- Granted patents
- 13
- Published applications
- 0
- Assignees
- 9
- Inventors
- 11
- Latest grant
- 2 May 1989
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Plough reversing method2 May 1989US 4,825,955 AKverneland A/S
- Fluid pressure system and value therefor2 Feb 1988US 4,722,262 AMassey-Ferguson Services N.V.
- Reversible plough having a reversing and adjustment mechanism3 Mar 1987US 4,646,849 AKverneland A/S
- Plough reversing mechanism5 Aug 1986US 4,603,745 AKverneland A/S
- Fully mounted variable width plow15 Nov 1983US 4,415,040 AInternational Harvester Company
No published applications in this class yet.
Most cited
By later US patents
- Reversible plough having a reversing and adjustment mechanism17US 4,646,849 AKverneland A/S · 1987
- Fully mounted variable width plow16US 4,415,040 AInternational Harvester Company · 1983
- Roll-over mechanism for two-way plow8US 4,067,396 A1978
- Fluid pressure system and value therefor6US 4,722,262 AMassey-Ferguson Services N.V. · 1988
- Moldboard plow5US 3,980,141 AStanton Supply Corporation · 1976