David L. Hird

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Pompton Lakes, NJ, US

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Patents Grantslast 30 patents

Information Patent Grant
Reciprocated concrete surfacer member with shielded spring return
- Patent number 4,320,924
- Issue date Mar 23, 1982
- Elco International
- Edward R. Langfield
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Hydraulically actuated tool for mechanically splitting rock-like ma...
- Patent number 4,215,901
- Issue date Aug 5, 1980
- Langfield; Edward R.
- Edward R. Langfield
- E21 - EARTH DRILLING MINING
Information Patent Grant
Hydraulically actuated tool for mechanically splitting rock-like ma...
- Patent number 4,114,951
- Issue date Sep 19, 1978
- Edward R. Langfield
- Edward R. Langfield
- E21 - EARTH DRILLING MINING