US2726972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming metal workpieces
Assignee: North American Aviation Corp
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Filing: 1953-06-01
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Granted: 1955-12-13
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Expires: 1973-06-01
Abstract
No abstract record available.
Inventors
- 👤 Joseph S Corral
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:12
CPC Classifications
B; B21; B21D; B21D22/00; B21D22/10; C; C22; C22F; C22F1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
THE METHOD OF FORMING A METAL WORKPIECE COMPRISING THE STEPS OF PROVIDING A DIE METAL WORKPIECE COMTOUR CORRESPONDING TO THAT DESIRED FOR SAID WORKPIECE; PROVIDING A QUANTITY OF GRANULAR MATERIAL IN AN OPEN RECEPTACLE; HEATING SAID WORKPIECE TO A HEAT TREATABLE TEMPERATURE; DISPOSING SAID HEATED WORKPIECE ON SAID GRANULAR MATERIAL; FORCING SAID SURFACE OF SAID DIE AGAINST SAID WORKPIECE WHEREBY SAID DIE AND SAID GRANULAR MATERIAL COOPERATE TO CONFORM SAID WORKPIECE TO THE CONTOUR OF SAID SURFACE; AND MAINTAINING SAID DIE SO FORCE AGAINST SAID WORKPIECE THEREBY TO COOL SAID WORKPIECE BY HEAT TRANSFER TO SAID DIE AND SAID GRANULAR MATERIAL, AND WITH SUFFICIENT FORCE TO SUBSTANTIALLY PRECLUDE ANY MOVEMENT OF SAID WORKPIECE DURING SAID COOLING FOR THEREBY RELIEVING INTERNAL STRESSES FROM SAID MATERIAL AND PERMANENTLY IMPARTING THE CONTOUR OF SAID DIE THERETO.
Claim 2
Independent Claim
133 words
THE METHOD OF FORMING A METAL WORKPIECE COMPRISING THE STEPS OF PROVIDING A DIE METAL WORKPIECE COMTOUR CORRESPONDING TO THAT DESIRED FOR SAID WORKPIECE; PROVIDING A QUANTITY OF GRANULAR MATERIAL IN AN OPEN RECEPTACLE; HEATING SAID WORKPIECE TO A HEAT TREATABLE TEMPERATURE; DISPOSING SAID HEATED WORKPIECE ON SAID GRANULAR MATERIAL; FORCING SAID SURFACE OF SAID DIE AGAINST SAID WORKPIECE WHEREBY SAID DIE AND SAID GRANULAR MATERIAL COOPERATE TO CONFORM SAID WORKPIECE TO THE CONTOUR OF SAID SURFACE; AND MAINTAINING SAID DIE SO FORCE AGAINST SAID WORKPIECE THEREBY TO COOL SAID WORKPIECE BY HEAT TRANSFER TO SAID DIE AND SAID GRANULAR MATERIAL, AND WITH SUFFICIENT FORCE TO SUBSTANTIALLY PRECLUDE ANY MOVEMENT OF SAID WORKPIECE DURING SAID COOLING FOR THEREBY RELIEVING INTERNAL STRESSES FROM SAID MATERIAL AND PERMANENTLY IMPARTING THE CONTOUR OF SAID DIE THERETO.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-12 | 1959-06-13 | 1959-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-12 | 1963-06-13 | 1963-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-12 | 1967-06-13 | 1967-12-13 | $7700.00 | Window Closed / Lapsed |