US3020596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for free forming of stretched sheet material
Assignee: GKN Aerospace Transparency Systems Inc
•
Filing: 1960-09-19
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Granted: 1962-02-13
•
Expires: 1980-09-19
Abstract
No abstract record available.
Inventors
- 👤 Robert J Clapp
- 👤 John E Jameson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:55
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/26; B29C51/42; B29C51/426; Y; Y10; Y10S; Y10S264/00; Y10S264/50; Y10S264/73
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
IN A PROCESS FOR FORMING FLAT STRETCHED THERMOPLASTIC SHEET MATERIAL OF TOUGH LAMINAR STRUCTURE INTO CURVED CONTOURS WITH SUBSTANTIAL DECREASE IN TOUGHNESS OF SUCH MATERIAL, THE STEPS COMPRISING: MECHANICALLY FORMING THE SHEET TO A CURVED CONTOUR WHILE IMPARTING STRESSES THEREIN, HOLDING THE SHEET TO SAID CONTOUR WHILE HEATING THE MAIN BODY OF THE SAME TO A TEMPERATURE SUBSTANTIALLY BELOW THE TERMOPLASTIC TEMPERATURE THEREOF AND ABOVE THE TEMPERATURE AT WHICH APPRECIABLE SHRINKAGE OCCURS WHILE MAINTAINING THE ENTIRE PERIPHERAL EDGE PORTIONS OF THE SHEET
Claim 2
Dependent Claim
82 words
IN A PROCESS FOR FORMING FLAT STRETCHED THERMOPLASTIC SHEET MATERIAL OF TOUGH LAMINAR STRUCTURE INTO CURVED CONTOURS WITH SUBSTANTIAL DECREASE IN TOUGHNESS OF SUCH MATERIAL, THE STEPS COMPRISING: MECHANICALLY FORMING THE SHEET TO A CURVED CONTOUR WHILE IMPARTING STRESSES THEREIN, HOLDING THE SHEET TO SAID CONTOUR WHILE HEATING THE MAIN BODY OF THE SAME TO A TEMPERATURE SUBSTANTIALLY BELOW THE TERMOPLASTIC TEMPERATURE THEREOF AND ABOVE THE TEMPERATURE AT WHICH APPRECIABLE SHRINKAGE OCCURS WHILE MAINTAINING THE ENTIRE PERIPHERAL EDGE PORTIONS OF THE SHEET
References Cited (Backward Citations)
US2282423A
Cited
US2468697A
Cited
US2444420A
Cited
US2784457A
Cited
US2749572A
Cited
US2759217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |