John H. Allen

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Boulder, CO, US

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Patents Grantslast 30 patents

Information Patent Grant
Load bearing concrete panel construction
- Patent number 6,708,362
- Issue date Mar 23, 2004
- John H. Allen
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
Information Patent Grant
Load bearing concrete panel reconstruction
- Patent number 4,991,248
- Issue date Feb 12, 1991
- Allen Research & Development Corp.
- John H. Allen
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES