US2944928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing paper pulp
Assignee: KIBRICK
•
Filing: 1957-09-20
•
Granted: 1960-07-12
•
Expires: 1977-09-20
Abstract
No abstract record available.
Inventors
- 👤 Andre C Kibrick
- 👤 Irwin W Scopp
- 👤 Raymond R Colton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:04
CPC Classifications
D; D21; D21C; D21C3/00; D21C3/02; D21C3/022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
IN THE METHOD OF PRODUCING WOOD PULP ACCORDING TO A PULPING PROCESS, THE IMPROVEMENT COMPRISING COOKING THE RAW WOOD IN SOLUTIONS OF ALKALI POLYSULFIDES WITH A SULFIDITY OF 10% TO 30% MAINTAINED BY ALKALI POLYSULFIDES.
Claim 2
Dependent Claim
35 words
IN THE METHOD OF PRODUCING WOOD PULP ACCORDING TO A PULPING PROCESS, THE IMPROVEMENT COMPRISING COOKING THE RAW WOOD IN SOLUTIONS OF ALKALI POLYSULFIDES WITH A SULFIDITY OF 10% TO 30% MAINTAINED BY ALKALI POLYSULFIDES.
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) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |