US3796785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of stretching a thermoplastic sheet using a shortened stretching zone
Assignee: Bayer AG
•
Filing: 1971-03-15
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Granted: 1974-03-12
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Expires: 1991-03-15
Abstract
Abstract A METHOD AND APPARATUS FOR STRETCHING THERMOPLASTIC IN A SHORTENED GAP BETWEEN A HEATED FEED ROLLER AND A HEATED DELIVERY ROLLER, THE TEMPERATURE OF THE FEED ROLLER BEING MAINTAINED BELIW THE SOFTENING TEMPERATURE OF THE PLASTIC IN ITS UNSTRETCHED STATE AND THE TEMPERATURE OF THE DELIVERY ROLLER BEING MAINTAINED ABOVE THE SOFTENING TEMPERATURE OF THE THERMOPLASTIC IN ITS UNSTRETCHED STATE AND BELOW SOFTENING THE TEMPERATURE OF THE THERMOPLASTIC IN ITS STRETCHED STATE.
Inventors
- 👤 W Rest
- 👤 K Huff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:57
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/04; Y; Y10; Y10S; Y10S264/00; Y10S264/73
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |