US3215588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous impregnation, cooking, and washing of fibrous material
Assignee: Lummus Technology LLC
•
Filing: 1963-08-15
•
Granted: 1965-11-02
•
Expires: 1983-08-15
Abstract
No abstract record available.
Inventors
- 👤 Theodor N Kleinert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:39
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/22; D21C3/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A PROCESS FOR THE PRODUCTION OF PULP FROM SUBDIVIDED PLANT MATERIAL SUCH AS WOOD CHIPS, WHICH COMPRISES: (A) IMPREGNATING SAID MATERIAL WITH DELIGNIFYING LIQUOR; (B) INTRODUCING SAID IMPREGNATED MATERIAL INTO A DELIGNIFICATION ZONE; (C) INTRODUCING STEAM INTO SAID DELIGNIFICATION ZONE WHEREBY RAPID HEATING OF SAID IMPREGNATED MATERIAL IN SAID ZONE TO SUBSTANTIALLY THE TEMPERATURE OF SAID STEAM IS EFFECTED; (D) PASSING SAID IMPREGNATED MATERIAL THROUGH SAID DELIGNIFICATION ZONE FOR A PERIOD OF TIME SUFFICIENT TO RENDER SOLUBLE, IN AN AQUEOUS LIQUID, A MAJOR PORTION OF THE AMORPHOUS SUBSTANCE OF SAID MATERIAL; (E) THEREAFTER PASSING SAID DELIGNIFIED MATERIAL TO A WASH ZONE; (F) INTRODUCING AN AQUEOUS PROCESSING LIQUID INTO SAID ZONE AND PASSING SAID PROCESSING LIQUID IN COUNTER-
Claim 2
Dependent Claim
117 words
A PROCESS FOR THE PRODUCTION OF PULP FROM SUBDIVIDED PLANT MATERIAL SUCH AS WOOD CHIPS, WHICH COMPRISES: (A) IMPREGNATING SAID MATERIAL WITH DELIGNIFYING LIQUOR; (B) INTRODUCING SAID IMPREGNATED MATERIAL INTO A DELIGNIFICATION ZONE; (C) INTRODUCING STEAM INTO SAID DELIGNIFICATION ZONE WHEREBY RAPID HEATING OF SAID IMPREGNATED MATERIAL IN SAID ZONE TO SUBSTANTIALLY THE TEMPERATURE OF SAID STEAM IS EFFECTED; (D) PASSING SAID IMPREGNATED MATERIAL THROUGH SAID DELIGNIFICATION ZONE FOR A PERIOD OF TIME SUFFICIENT TO RENDER SOLUBLE, IN AN AQUEOUS LIQUID, A MAJOR PORTION OF THE AMORPHOUS SUBSTANCE OF SAID MATERIAL; (E) THEREAFTER PASSING SAID DELIGNIFIED MATERIAL TO A WASH ZONE; (F) INTRODUCING AN AQUEOUS PROCESSING LIQUID INTO SAID ZONE AND PASSING SAID PROCESSING LIQUID IN COUNTER-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |