The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 29, 1977
Filed:
May. 09, 1975
George Richard Bell, Larkspur, CO (US);
Richard Seyb Lamar, Littleton, CO (US);
Johns-Manville Corporation, Denver, CO (US);
Abstract
In the manufacture of wood pulp for use in making paper and other wood fiber products, it is first necessary to remove the bark from the logs. While this can be done using a dry process, a wet process offers many advantages. However, one big disadvantage of the wet process has been the inability to economically remove the bark fines from the water used in the wet process. The present invention provides an economical manner of solving this problem by using a rotary vacuum precoat filter equipped with a rotating knife to remove the bark fines from at least a portion of the recirculating water in a wet debarking process and to avoid long range problems with such a process by adding a small amount of finely divided talc to the bark fines suspension prior to filtration.