US3580769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making corrugated thermoplastic articles
Assignee: Chevron USA Inc
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Filing: 1970-01-19
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Granted: 1971-05-25
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Expires: 1990-01-19
Abstract
Abstract CORRUGATED THERMOPLASTIC ARTICLES ARE MADE BY SIMULTANEOUSLY PERFORATING IN CLOSELY SPACED PARALLEL ROWS AT LEAST TWO UNIAXIALLY ORIENTED SHEETS OF THERMOPLASTIC POLYMER IN INTIMATE CONTACT AT AN ANGLE OF AT LEAST ABOUT 10* RELATIVE TO ORIENTATION WITH HEAT TO AT LEAST FUSION TEMPERATURE OF THE TERMOPLASTIC, COOLING FUSED PERIPHERIES OF THE PERFORATIONS AND ANNEALING THE PERFORATED FILMS.
Inventors
- 👤 Phillip H Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:32
CPC Classifications
B; B65; B65D; B65D65/00; B65D65/38; B65D65/40; B65D65/403; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1016; Y10T156/1018; Y10T156/1052; Y10T156/1054; Y10T156/1056; Y10T156/1057
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |