Patent US3238753A successfully refreshed from Google Patents.
US3238753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stretch forming apparatus and method
Assignee: Lockheed Martin Corp
•
Filing: 1962-11-05
•
Granted: 1966-03-08
•
Expires: 1982-11-05
Abstract
No abstract record available.
Inventors
- 👤 Benatar Victor
- 👤 Ira H Carpenter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:25
CPC Classifications
B; B21; B21D; B21D26/00; B21D26/02; B21D26/06; B21D26/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49805; Y10T29/49806
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A METHOF OF STRETCH FORMING A PIECE OF SHEET METAL INTO A SHALLOW CONTOURED WORK PIECE OVER A MALE DIE OF SHALLOW CONTOURED CONFIGURATION HAVING A PERIPHERAL STRETCH GROOVE, SAID STRETCH FORMED WORK PIECE HAVING TRIM STOCK AROUND THE PERIPHERY THEREOF WITH A GROOVE FORMED FROM THE DIE STRETCH GOOVE LOCATED IN THE TRIM STOCK PORTION OF THE SHEET METAL OUTSIDE OF THE PERIPHERY OF THE FINAL DESIRED AREA OF THE STRETCH FORMED WORK PIECE COMPRISING THE STEPS OF: SECURING THE EDGE OF THE SHEET METAL PIECE TO THE DIE IN COVERING RELATION TO THE STRETCH GROOVE; PLACING EXPLOSIVE MEDIUM ABOVE THE SHEET METAL SUCH THAT PRESSURE WAVES GENERATED BY ITS DETONATION WILL IMPINGE UPON AND BE DISTRIBUTED OVER THE AREA OF THE
Claim 2
Dependent Claim
123 words
A METHOF OF STRETCH FORMING A PIECE OF SHEET METAL INTO A SHALLOW CONTOURED WORK PIECE OVER A MALE DIE OF SHALLOW CONTOURED CONFIGURATION HAVING A PERIPHERAL STRETCH GROOVE, SAID STRETCH FORMED WORK PIECE HAVING TRIM STOCK AROUND THE PERIPHERY THEREOF WITH A GROOVE FORMED FROM THE DIE STRETCH GOOVE LOCATED IN THE TRIM STOCK PORTION OF THE SHEET METAL OUTSIDE OF THE PERIPHERY OF THE FINAL DESIRED AREA OF THE STRETCH FORMED WORK PIECE COMPRISING THE STEPS OF: SECURING THE EDGE OF THE SHEET METAL PIECE TO THE DIE IN COVERING RELATION TO THE STRETCH GROOVE; PLACING EXPLOSIVE MEDIUM ABOVE THE SHEET METAL SUCH THAT PRESSURE WAVES GENERATED BY ITS DETONATION WILL IMPINGE UPON AND BE DISTRIBUTED OVER THE AREA OF THE
References Cited (Backward Citations)
SE115846C1
Cited
US3065720A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |