US3673032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of thermoplastic sheets having longitudinal and transverse corrugations
Assignee: Imperial Chemical Industries Ltd
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Filing: 1971-03-17
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Granted: 1972-06-27
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Expires: 1991-03-17
Abstract
Abstract THERMOPLASTIC POLYMERIC SHEET OF IMPROVED RIGIDITY IS FORMED BY PASSING A LONGITUDINALLY CORRUGATED EXTRUDED THERMOPLASTIC POLYMERIC SHEET IN THE LONGITUDINAL DIRECTION BETWEEN TWO MEANS FOR INTRODUCING FURTHER CORRUGATIONS OR UNDULATIONS IN SAID SHEET, WHEREBY THE SHEET IS PERMITTED TO MOVE IN THE LONGITUDINAL DIRECTION BUT RESTRAINED FROM MOVEMENT IN ANY OTHER DIRECTION RELATIVE TO THE POINTS, SAID SHEET BEING IN A MOULDABLE STATE DURING AT LEAST PART OF ITS TRAVEL BETWEEN SAID MEANS AND FURTHER CORRUGATIONS OR UNDULATIONS BEING INTRODUCED INTO SAID SHEET BY RECIPROCATING SAID MEANS RELATIVE TO ONE ANOTHER.
Inventors
- 👤 Thomas John Komoly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:16
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/20; B29C48/00; B29C48/001; B29C48/0013; B29C48/0014; B29C48/03; B29C48/07; B29C48/08; B29C48/12; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/302; B29C53/00; B29C53/22; B29C53/24; B29C53/26; B32; B32B; B32B27/00; B29C48/0011; B29C48/0017; B29C48/13; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1025
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |