Method, system and withdrawal screen section for impregnating chips
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Feb 11, 2014
Grant Date -
Sep 19, 2013
app pub date -
Aug 25, 2010
filing date -
Aug 25, 2010
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The method, system and a withdrawal screen section are for the impregnation of chips during the manufacture of chemical pulp. Chips are both steamed and impregnated in a low pressure impregnation vessel, using pressurized hot spent cooking liquor BL as the main part of the impregnation liquid. The hot spent cooking liquor produces most of the steam BLST necessary for steaming the chips. At least two independent first and second screen rows, SC1 and SC1b respectively, are installed in order to improve the process in the impregnation vessel. The first screen row withdraws acidified treatment liquor for disposal which otherwise would be a parasitic acidified waste fluid in the system. The second screen row recirculates treatment fluid back to center of treatment vessel in order to even out the pH profile over the cross section of the vessel.
First Claim
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Family

- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
---|---|---|
VALMET AKTIEBOLAG | GUSTAF GIDLOEFS VAEG 4 SUNDSVALL S-851 94 |
International Classification(s)

- 2010 Application Filing Year
- D21C Class
- 111 Applications Filed
- 78 Patents Issued To-Date
- 70.28 % Issued To-Date
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Furhem, Hans | Skoghall, SE | 1 | 7 |
# of filed Patents : 1 Total Citations : 7 | |||
Trolin, Daniel | Camacari, BR | 13 | 24 |
# of filed Patents : 13 Total Citations : 24 |
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Patent Citation Ranking
- 2 Citation Count
- D21C Class
- 26.98 % this patent is cited more than
- 11 Age
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Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Aug 11, 2025 |
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Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
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