Patent US2405381A successfully refreshed from Google Patents.
US3394569A
Expired / Lapsed
US
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Forming method and apparatus
Assignee: General Dynamics Corp
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Filing: 1966-06-23
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Granted: 1968-07-30
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Expires: 1986-06-23
Abstract
No abstract record available.
Inventors
- 👤 Smith Kenneth Franklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:16
CPC Classifications
B; B21; B21D; B21D26/00; B21D26/02; B21D26/06; B21D26/10; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49936
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A METHOD OF FORMING A WORKPIECE COMPRISING SUBJECTING THE WORKPIECE TO A FORCE DEVELOPED BY HYDRAULIC FLUID PRESSURE TO PARTIALLY FORM THE WORKPIECE AT A RELATIVELY SLOW STRAIN RATE, AND SUBSEQUENTLY SUBJECTING THE WORKPIECE TO A FORCE PRODUCED BY A SPARK IN A HYDRAULIC
Claim 2
Independent Claim
44 words
A METHOD OF FORMING A WORKPIECE COMPRISING SUBJECTING THE WORKPIECE TO A FORCE DEVELOPED BY HYDRAULIC FLUID PRESSURE TO PARTIALLY FORM THE WORKPIECE AT A RELATIVELY SLOW STRAIN RATE, AND SUBSEQUENTLY SUBJECTING THE WORKPIECE TO A FORCE PRODUCED BY A SPARK IN A HYDRAULIC
References Cited (Backward Citations)
US788119A
Cited
US2138199A
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US2847957A
Cited
US3232085A
Cited
US3160130A
Cited
US3350905A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-30 | 1972-01-29 | 1972-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-30 | 1976-01-29 | 1976-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-30 | 1980-01-29 | 1980-07-30 | $7700.00 | Window Closed / Lapsed |