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Donald F. Lehman
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Middletown, OH, US
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last 30 patents
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Patent Grant
Apparatus for screening paper fiber stock
Patent number
4,276,159
Issue date
Jun 30, 1981
The Black Clawson Company
Donald F. Lehman
B07 - SEPARATING SOLIDS FROM SOLIDS SORTING
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Patent Grant
Screening apparatus
Patent number
4,017,387
Issue date
Apr 12, 1977
The Black Clawson Company
Derald R. Hatton
B07 - SEPARATING SOLIDS FROM SOLIDS SORTING
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Patent Grant
Method of treating paper fibers in a stationary screen
Patent number
3,947,314
Issue date
Mar 30, 1976
The Black Clawson Company
David E. Chupka
D21 - PAPER-MAKING PRODUCTION OF CELLULOSE