John K. Martin

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Calgary, Alberta, CA

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Patents Grantslast 30 patents

Information Patent Grant
Rail seat crown and concrete rail tie having the same
- Patent number 10,011,954
- Issue date Jul 3, 2018
- John K. Martin
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
Information Patent Grant
Rail track surface structure
- Patent number 6,415,988
- Issue date Jul 9, 2002
- John K. Martin
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
Information Patent Grant
Rail track surface structure
- Patent number 5,622,312
- Issue date Apr 22, 1997
- John K. Martin
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
Information Patent Grant
Railway crossing insert
- Patent number 4,899,933
- Issue date Feb 13, 1990
- John K. Martin
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES