Patent US3255051A successfully refreshed from Google Patents.
US3255051A
Expired / Lapsed
US
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Method for strengthening iron base alloys
Assignee: Aerojet Rocketdyne Inc
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Filing: 1962-07-25
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Granted: 1966-06-07
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Expires: 1982-07-25
Abstract
No abstract record available.
Inventors
- 👤 Lawrence L Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:01
CPC Classifications
C; C21; C21D; C21D8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
METHOD FOR HARDENING AND STRENGTHENING A PRESSURE VESSEL COMPOSED OF AN ANNEALED AUSTENITIC STAINLESS STEEL WHICH METHOD COMPRISES INTRODUCING WITHIN SAID PRESSURE VESSEL A SUBZERO LIQUID WHEREBY SAID PRESSURE VESSEL IS COOLED TO A TEMPERATURE IN THE ORDER OF THE MARTENSITIC TRANSFORMATION TEMPERATURE FOR THE STAINLESS STEEL COMPRISING SAID PRESSURE VESSEL, AND THEREAFTER DEFORMING SAID PRESSURE VESSEL IN AN AMOUNT UP TO ABOUT FIFTEEN PERCENT DEFORMATION THROUGH MEANS OF THE PRESSURE APPLIED TO THE INTERIOR OF SAID PRESSURE VESSEL BY THE SUBZERO FLUID.
Claim 2
Dependent Claim
83 words
METHOD FOR HARDENING AND STRENGTHENING A PRESSURE VESSEL COMPOSED OF AN ANNEALED AUSTENITIC STAINLESS STEEL WHICH METHOD COMPRISES INTRODUCING WITHIN SAID PRESSURE VESSEL A SUBZERO LIQUID WHEREBY SAID PRESSURE VESSEL IS COOLED TO A TEMPERATURE IN THE ORDER OF THE MARTENSITIC TRANSFORMATION TEMPERATURE FOR THE STAINLESS STEEL COMPRISING SAID PRESSURE VESSEL, AND THEREAFTER DEFORMING SAID PRESSURE VESSEL IN AN AMOUNT UP TO ABOUT FIFTEEN PERCENT DEFORMATION THROUGH MEANS OF THE PRESSURE APPLIED TO THE INTERIOR OF SAID PRESSURE VESSEL BY THE SUBZERO FLUID.
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) | 1969-06-06 | 1969-12-06 | 1970-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-06 | 1973-12-06 | 1974-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-06 | 1977-12-06 | 1978-06-07 | $7700.00 | Window Closed / Lapsed |