for grooving or corrugating

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Patents Grantslast 30 patents

Information Patent Grant
Machine grooved joint on hollow concrete cylinders
- Patent number 4,109,635
- Issue date Aug 29, 1978
- John C. Rossborough
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
2984886
- Patent number 2,984,886
- Issue date May 23, 1961
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
2713189
- Patent number 2,713,189
- Issue date Jul 19, 1955
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
2630613
- Patent number 2,630,613
- Issue date Mar 10, 1953
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
2451713
- Patent number 2,451,713
- Issue date Oct 19, 1948
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
2291899
- Patent number 2,291,899
- Issue date Aug 4, 1942
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
2044178
- Patent number 2,044,178
- Issue date Jun 16, 1936
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
1547959
- Patent number 1,547,959
- Issue date Jul 28, 1925
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
1411533
- Patent number 1,411,533
- Issue date Apr 4, 1922
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
1411535
- Patent number 1,411,535
- Issue date Apr 4, 1922
- B28 - WORKING CEMENT, CLAY, OR STONE