US3751328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrugated polyethylene terephthalate film and preparation thereof
Assignee: Superior Essex Inc
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Filing: 1965-10-13
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Granted: 1973-08-07
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Expires: 1985-10-13
Abstract
Abstract CORRUGATED POLYETHYLENE TEREPHTHALATE FILM IS PROVIDED HAVING A COEFFICIENT OF FRICTION OF LESS THAN ABOUT 0.40. BEFORE CORRUGATION, THE FILM MAY BE BIAXIALLY ORIENTED AND HEAT SET AT A TEMPERATURE OF 180* TO 220*C. AND WITH THE THICKNESS BEING LESS THAN ABOUT 10 MILS, PREFERABLY 1-3 MILS. THE CORRUGATION CAN BE ACCOMPLISHED BY SHAPING AT 100* TO 175*C. (PREFERABLY, 120* TO 140*C.) BETWEEN COACTING ROATING SURFACES, PREFERABLY MAINTAINED AT THE SAME TEMPERATURE. THE COEFFICIENT OF FRICTION IS PREFERABLY REDUCED TO BELOW 0.35.
Inventors
- 👤 W Roberts
- 👤 P Burch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:45
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/18; B; B29; B29C; B29C53/00; B29C53/22; B29C59/00; B29C59/02; B29C59/04; H01B11/00; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1025; Y10T428/00; Y10T428/24; Y10T428/24628; Y10T428/24669; Y10T428/24694
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |