Lev N. Laptev

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Leningrad, SU

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Patents Grantslast 30 patents

Information Patent Grant
Refiner disk
- Patent number 4,351,489
- Issue date Sep 28, 1982
- Lev N. Laptev
- D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
Information Patent Grant
Filtering material and process for producing same
- Patent number 4,194,945
- Issue date Mar 25, 1980
- Oleg A. Malev
- D21 - PAPER-MAKING PRODUCTION OF CELLULOSE