Robert D. Hennessey

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Golden Valley, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Sweeper with dual seal filter
- Patent number 5,647,093
- Issue date Jul 15, 1997
- Tennant Company
- Gregory J. Engel
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
Information Patent Grant
Hopper and filter chamber for direct forward throw sweeper
- Patent number 5,303,448
- Issue date Apr 19, 1994
- Tennant Company
- Robert D. Hennessey
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
Information Patent Grant
Damage resistant recirculation flap
- Patent number 5,276,933
- Issue date Jan 11, 1994
- Tennant Company
- Robert D. Hennessey
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
Information Patent Grant
No-tool brush changing means
- Patent number 5,231,725
- Issue date Aug 3, 1993
- Tennant Company
- Robert D. Hennessey
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES