US3327952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of fibrous materials for the production of paper and cardboard
Assignee: West Virginia Pulp and Paper Co
•
Filing: 1965-06-30
•
Granted: 1967-06-27
•
Expires: 1985-06-30
Abstract
No abstract record available.
Inventors
- 👤 Klaus W Rosenfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:55
CPC Classifications
D; D21; D21D; D21D1/00; D21D1/004; D21D1/006; D21B; D21B1/00; D21B1/04; D21B1/12; D21D1/20; D21D1/34; D21D1/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
IN THE METHOD FOR THE PREPARATION OF FIBROUS MATERIALS FOR THE PRODUCTION OF PAPER AND CARDBOARD WHICH INVOLVES INTRODUCING A HIGH CONSISTENCY SUSPENSION OF FIBERS INTO A REFINER AND PASSING THE FIBROUS SUSPENSION BETWEEN OPPOSING FIBER REFINING ELEMENTS OF THE REFINER, THE IMPROVEMENT WHICH COMPRISES SETTING THE CLEARANCE BETWEEN THE FIBER REFINING ELEMENTS AT A DISTANCE SUBSTANTIALLY EQUAL TO HALF THE MEAN FIBER LENGTH OF THE FIBERS IN THE SUSPENSION.
Claim 2
Dependent Claim
70 words
IN THE METHOD FOR THE PREPARATION OF FIBROUS MATERIALS FOR THE PRODUCTION OF PAPER AND CARDBOARD WHICH INVOLVES INTRODUCING A HIGH CONSISTENCY SUSPENSION OF FIBERS INTO A REFINER AND PASSING THE FIBROUS SUSPENSION BETWEEN OPPOSING FIBER REFINING ELEMENTS OF THE REFINER, THE IMPROVEMENT WHICH COMPRISES SETTING THE CLEARANCE BETWEEN THE FIBER REFINING ELEMENTS AT A DISTANCE SUBSTANTIALLY EQUAL TO HALF THE MEAN FIBER LENGTH OF THE FIBERS IN THE SUSPENSION.
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) | 1970-06-26 | 1970-12-26 | 1971-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-26 | 1974-12-26 | 1975-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-26 | 1978-12-26 | 1979-06-27 | $7700.00 | Window Closed / Lapsed |