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This page describes the pertinent
USA patents
for digester technology.
Basic Batch Digester Displacement Patent
- Designee: Beloit Corp
- Fagerlund, #4,578,149; Process for Digesting Cellulosic
Material with Heat Recovery. This is the basic displacement
concept for DDS, RDH, SuperBatch, EnerBatch and CBC. Expired in March
2003.
Grant, #4,849,052; Batch Digester Multi-Stage
Pulping Process. This is a two step cook (ie two hot liquor fills with TTT/TAT operations using less white liquor in the second). Expired in 2006.
Related
Patents and Filings (Partial Listing)
Designee: CabTec International llc (Licensed to Chemical and
Pulping)
Bianchini, #7,604,711; Method to Optimize Temperature Profiles in
Displacement Batch Cooking.
This is marketed with the DDS system. Expiration on 8 Sep 26.
Bianchini, #7,282,115 (6,752,903 Divisional); Method and Apparatus to Mitigate the Interference Caused by High Molecular Weight
By-Products in Pulping Processes. Expiration in August 2021.
Bianchini, #6,752,903; Method and Apparatus to Mitigate the Interference Caused by High Molecular Weight
By-Products in Pulping Processes. Expiration in August 2021.
Bianchini, Patent Pending; Method and
Apparatus to Distribute the Inflow of Liquors in a Batch Digester.
This is marketed with the DDS and DSS systems. Filed 19 Jan 05.
Bianchini, Patent Pending; Method and
Apparatus to Decrease Steam Consumption in Conventional Batch Digesters.
This is marketed with the DSS system. Filed 19 Apr 05.
Designee: Beloit (Purchased by GL&V)
Fagerlund, #6,103,057; Kraft Digesting Process
Wherein a Vapor Interface is Formed by Withdrawing Hot Cooking Liquor. This is the 'gas-off' concept, market by GL&V
as part of RDH 2000. Expiration in 2020.
Polston et. al., #6,139,689; Apparatus for
Digesting Pulp in a Displacement Batch Digester that uses Displacement Liquor
having a sufficient Hydrostatic Head. This
is the 'single feed line' concept, market by GL&V as RDH 2000.
Expiration in 2017.
Fagerlund, #5,080,757; Method to Displace a
Digester from Both Ends. This is marketed
by GL&V as part of RDH 2000, RDH DD or as Dual C. Expired in 14 Jan 2009.
Fagerlund, #5,059,284; Apparatus to Displace a
Digester from Both Ends. This is marketed
by GL&V as part of RDH 2000, RDH DD or as Dual C. Expired in 28 Oct 2008.
Fagerlund, #4,601,787; Method of Bringing a Digester
up to Cooking
Temperature. Beloit referred to this idea as the 'charge tank' concept. Expired
on July 22, 2003.
The information concerning patents as well as an
electronic search function can be accessed at various government websites,
including the
US Patent Office and
the Canadian Patent
Office.
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Chemical and Pulping Ltd
