Patent US2726973A successfully refreshed from Google Patents.
US2726973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for forming and quenching metal
Assignee: North American Aviation Corp
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Filing: 1952-05-24
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Granted: 1955-12-13
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Expires: 1972-05-24
Abstract
No abstract record available.
Inventors
- 👤 Joseph S Corral
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:37
CPC Classifications
C; C22; C22F; C22F1/00; C21; C21D; C21D1/00; C21D1/62; C21D1/673
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
THE METHOD OF PROVIDING AN INTEGRALLY STIFFENED FORMED PART FROM A METAL WORKPIECE HAVING AT LEAST ONE RECESS COMPRISING THE STEPS OF HEATING SAID WORKPIECE TO A HEAT TREATABLE TEMPERATURE; URGING FORMING MEANS INTO ENGAGEMENT WITH ALL PORTIONS OF SAID WORKPIECE REMOTE FROM SAID RECESS TO THEREBY FORCE SAID WORKPIECE TO ASSUME A PREDETERMINED CONTOUR; INTRODUCING PRESSURIZED FLUID INTO SAID RECESS TO URGE THE SURFACE OF SAID WORKPIECE OPPOSITE, FROM SAID RECESS INTO ENGAGEMENT WITH SAID FORMING MEANS; AND MAINTAINING SAID WORKPIECE TO SAID TO PERMIT TRANSFER OF HEAT FROM SAID WORKPIECE TO SAID FLUID AND TO SAID FORMING MEANS TO QUENCH SAID WORKPIECE, SAID ENGAGEMENT BEING MAINTAINED WITH A FORCE SUFFICIENT TO PRECLUDE CONTRACTION OF SAID WORKPIECE DURING SAID QUENCHING WHEREBY SAID WORKPIECE IS UNIFORMLY WORKED AND STRESS-RELIEVED.
Claim 2
Independent Claim
129 words
THE METHOD OF PROVIDING AN INTEGRALLY STIFFENED FORMED PART FROM A METAL WORKPIECE HAVING AT LEAST ONE RECESS COMPRISING THE STEPS OF HEATING SAID WORKPIECE TO A HEAT TREATABLE TEMPERATURE; URGING FORMING MEANS INTO ENGAGEMENT WITH ALL PORTIONS OF SAID WORKPIECE REMOTE FROM SAID RECESS TO THEREBY FORCE SAID WORKPIECE TO ASSUME A PREDETERMINED CONTOUR; INTRODUCING PRESSURIZED FLUID INTO SAID RECESS TO URGE THE SURFACE OF SAID WORKPIECE OPPOSITE, FROM SAID RECESS INTO ENGAGEMENT WITH SAID FORMING MEANS; AND MAINTAINING SAID WORKPIECE TO SAID TO PERMIT TRANSFER OF HEAT FROM SAID WORKPIECE TO SAID FLUID AND TO SAID FORMING MEANS TO QUENCH SAID WORKPIECE, SAID ENGAGEMENT BEING MAINTAINED WITH A FORCE SUFFICIENT TO PRECLUDE CONTRACTION OF SAID WORKPIECE DURING SAID QUENCHING WHEREBY SAID WORKPIECE IS UNIFORMLY WORKED AND STRESS-RELIEVED.
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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) | 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 |