Patent US2918696A successfully refreshed from Google Patents.
US2918696A
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Method and apparatus for stretching thermoplastic sheet material
Assignee: Swedlow Plastics Co
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Filing: 1956-07-26
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Granted: 1959-12-29
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Expires: 1976-07-26
Abstract
No abstract record available.
Inventors
- 👤 Paul H Bottoms
- 👤 Robert J Clapp
- 👤 Reuben H Loggins
- 👤 John G Stansbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:18
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; B29C55/10; B29C55/12; B29C55/16; B29C55/165; Y; Y10; Y10S; Y10S425/00; Y10S425/053
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
IN A PROCESS FOR MULTIDIRECTIONALLY STRECHING THERMO-PLASTIC SHEET MATERIAL, THE STEPS COMPRISING HEATING THE MAIN BODY OF A THERMOPLASTIC SHEET TO A FORMING TEMPERATURE, MAINTAINING SPACED PORTIONS OF SAID SHEET ADJACENT THE EDGES THEREOF AND EXTENDING AROUND THE ENTIRE PERIPHERY THEREOF AT A TEMPERATUARE BELOW SAID FORMING TEMPERATURE, THE PORTIONS OF SAID SHEET ADJACENT THE EDGES AND BETWEEN SAID SPACED PORTIONS BEING HEATED TO
Claim 2
Dependent Claim
64 words
IN A PROCESS FOR MULTIDIRECTIONALLY STRECHING THERMO-PLASTIC SHEET MATERIAL, THE STEPS COMPRISING HEATING THE MAIN BODY OF A THERMOPLASTIC SHEET TO A FORMING TEMPERATURE, MAINTAINING SPACED PORTIONS OF SAID SHEET ADJACENT THE EDGES THEREOF AND EXTENDING AROUND THE ENTIRE PERIPHERY THEREOF AT A TEMPERATUARE BELOW SAID FORMING TEMPERATURE, THE PORTIONS OF SAID SHEET ADJACENT THE EDGES AND BETWEEN SAID SPACED PORTIONS BEING HEATED TO
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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) | 1962-12-28 | 1963-06-29 | 1963-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-28 | 1967-06-29 | 1967-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-28 | 1971-06-29 | 1971-12-29 | $7700.00 | Window Closed / Lapsed |