Patent US1528254A successfully refreshed from Google Patents.
Patent US2920349A successfully refreshed from Google Patents.
US2920349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene films
Assignee: EIDP Inc
•
Filing: 1957-09-10
•
Granted: 1960-01-12
•
Expires: 1977-09-10
Abstract
No abstract record available.
Inventors
- 👤 White James Rushton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:47
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/42; D01D5/423; Y; Y10; Y10S; Y10S264/00; Y10S264/47
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A PROCESS WHICH COMPRISES SUBJECTING A SUBSTANTIALLY LINEAR CRYSTALLIZABLE ETHYLENE POLYMER, IN PARTICLE FORM AND HAVING A DENSITY AT 25* C. OF AT LEAST 0.945, TO SUFFICIENT COMPRESSIVE SHEAR IN A SINGLE DIRECTION AT A TEMPERATURE BETWEEN ABOUT 75* C. AND ABOUT 135* C. TO COALESCE THE POLYMER, AND FIBRILLATING THE FLIM BY APPLYING FORCE THERETO IN A DIRETION TRANSVERSE TO THE DIRECTION OF APPLICATION OF SHEAR.
Claim 2
Dependent Claim
67 words
A PROCESS WHICH COMPRISES SUBJECTING A SUBSTANTIALLY LINEAR CRYSTALLIZABLE ETHYLENE POLYMER, IN PARTICLE FORM AND HAVING A DENSITY AT 25* C. OF AT LEAST 0.945, TO SUFFICIENT COMPRESSIVE SHEAR IN A SINGLE DIRECTION AT A TEMPERATURE BETWEEN ABOUT 75* C. AND ABOUT 135* C. TO COALESCE THE POLYMER, AND FIBRILLATING THE FLIM BY APPLYING FORCE THERETO IN A DIRETION TRANSVERSE TO THE DIRECTION OF APPLICATION OF SHEAR.
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) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |