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David S. Lofts
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Vancouver, WA, US
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last 30 patents
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Patent Grant
Method for mixing concrete using a cementitious material/liquid pre...
Patent number
5,427,448
Issue date
Jun 27, 1995
Hydromix, Inc.
Donald J. Macaulay
B28 - WORKING CEMENT, CLAY, OR STONE
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Patent Grant
Concrete mixing system with cement/water premixer
Patent number
5,352,035
Issue date
Oct 4, 1994
Hydromix, Inc.
Donald J. Macaulay
B28 - WORKING CEMENT, CLAY, OR STONE