John O. de Mars

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Wilmington, MA, US

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Patents Grantslast 30 patents

Information Patent Grant
Packaging and dispensing system for fluid and semi-fluid cement adm...
- Patent number 5,320,851
- Issue date Jun 14, 1994
- W. R. Grace & Co.-Conn.
- John O. de Mars
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Thermographic method for determining the volume of concrete in a mi...
- Patent number 5,099,688
- Issue date Mar 31, 1992
- W. R. Grace & Co.-Conn.
- John O. de Mars
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL