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.
Shin, US Patent Pending; Impact of
Temperature and Alkali Charge on Pulp Brightness. This is the 'white
liquor profiling' concept included in all displacement batch systems.
Filed in 1996.
Bohm, US Patent Pending; Improved Displacement Batch Digester Cooking
Systems; Filed in 1994.
Rüf et. al., US
Patent Pending; Strong Sulfite Kraft Pulping;
Filed in 1994.
Designee: Andritz-Ahlstrom
Marcoccia, et al, #5,620,562; Dissolved Solids
Control in Pulp Production; Expiration in 2017.
Designee: Lenzing Technik AG
Östman, #4,764,251; Method for the
Impregnation and Cooking of Lignocellulosic Material by Batch Cooking using
Spent Impregnation Liquor from a Previous Batch; Expiration in 2005.
Hepp, US Patent Pending; Continuously Guiding Liquids; Filed in
1996.
Designee: Mo Och
Domsjo AB
Thorsell, #4,670,098; Process for Preparing
Cellulose Pulp from Lignocellulosic Material while Removing High Molecular
Weight Substances from the Pulping Liquor; Expiration in 2007.
Designee:
St. Regis Paper Company
Steltenkamp, #4,507,172; Kraft Pulping Process. This recausticizes the black liquor directly with
lime. Expired in 2002.
Designee:
Ekono OY
Ostman, #4,764,251; Method for Impregnation and
Cooking of Lignocellulosic Material by a Batch Cooking using Spent Impregnation
Liquor form a Previous Batch; Expiration in 2005.
Designee: Pulp & Paper Research Institute of
Canada
MacLeod, #4,814,042; Method for Discharging
Delignified Cellulosic Materials from Digesters.
This refers to discharging using a pump. Expiration in 2006.
