US3347739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous sodium sulfide pulping of cellulosic material
Assignee: Individual
•
Filing: 1963-09-13
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Granted: 1967-10-17
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Expires: 1983-09-13
Abstract
No abstract record available.
Inventors
- 👤 Ii George H Tomlinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:14
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0064; D21C11/0078; D21C3/00; D21C3/02; D21C3/022; Y; Y10; Y10S; Y10S423/00; Y10S423/03
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
129 words
A PROCESS FOR CONTINUOUSLY PRODUCING PULP FROM CELLULOSIC RAW MATERIAL COMPRISING: INTRODUCING A DIGESTION LIQUOR CONTAINING AN ALKALI METAL SULPHIDE AS SUBSTANTIALLY THE ONLY ACTIVE DIGESTION CHEMICAL INTO AN IMPREGNATION ZONE, MAINTAINING A BODY OF SAID LIQUOR AT A TEMPERATURE BELOW DIGESTION TEMPERATURE AND AT SUPERATMOSPHERIC PRESSURE IN SAID IMPREGNATION ZONE, INTRODUCING SAID CELLULOSIC RAW MATERIAL INTO SAID IMPREGNATION ZONE AND MAINTAINING SAID MATERIAL IN SAID IMPREGNATION ZONE WHEREBY SAID MATERIAL RETAINS A QUANTITY OF DIGESTION LIQUOR CARRYING SUFFICIENT CHEMICAL FOR SUBSEQUENT DIGESTION, CONDUCTING SAID CELLULOSIC RAW MATERIAL SUBSTANTIALLY FREE OF EXCESS DIGESTION LIQUOR INTO A DIGESTION ZONE, DIGESTING SAID MATERIAL IN SAID DEGESTION ZONE AT A DIGESTION TEMPERATURE BY MEANS OF THE DIGESTION LIQUOR RETAINED THEREIN TO FORM A PULP AND THEREBY REDUCING THE ODOR FROM SAID DIGESTION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |