US3061487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for improving the physical properties of semi-austenitic stainless steels
Assignee: North American Aviation Corp
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Filing: 1960-07-18
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Granted: 1962-10-30
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Expires: 1980-07-18
Abstract
No abstract record available.
Inventors
- 👤 Melill Joseph
- 👤 Salmassy Sherwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:50
CPC Classifications
C; C21; C21D; C21D6/00; C21D6/002
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A METHOD OF CONDITIONING SEMI-AUSTENITIC, PRECIPITATION HARDENABLE STAINLESS STEEL WHICH COMPRISES HEATING SAID STEEL TO A TEMPERATURE BETWEEN ABOUR THE AR1-AE3 TEMPERATURES TO PRECIPITATE ALLOYING CONSTITUENTS FROM THE MATRIX, COOLING TO A TEMPERATURE NO HIGHER THAN NORMAL ROOM TEMPERATURE TO EFFECT PHASE TRANSFORMATION TO FERRITE, THEREBY RESULTING IN GRAIN REFINEMENT WITH ALLOYING CONSTITUENTS CONCENTRATED ALONG GRAIN BOUNDARIES, REHEATING SAID STEEL TO NOT LESS THAB THE ACM TEMPERATURE, TO DISOLVE THE ALLOYING CONSTITUENTS WITHIN THE AUSTENITIC MATRIC, AND THEREAFER COOLING TO A TEMPERATURENO HIGHER THAN NORMAL ROOM TEMPERATURE TO FORM A FINE GRAIN STRUCTURE WITH HOMOGENEOUS DISTRIBUTION OF ALLOYING CONSTITUENTS IN THE MATRIX.
Claim 2
Independent Claim
102 words
A METHOD OF CONDITIONING SEMI-AUSTENITIC, PRECIPITATION HARDENABLE STAINLESS STEEL WHICH COMPRISES HEATING SAID STEEL TO A TEMPERATURE BETWEEN ABOUR THE AR1-AE3 TEMPERATURES TO PRECIPITATE ALLOYING CONSTITUENTS FROM THE MATRIX, COOLING TO A TEMPERATURE NO HIGHER THAN NORMAL ROOM TEMPERATURE TO EFFECT PHASE TRANSFORMATION TO FERRITE, THEREBY RESULTING IN GRAIN REFINEMENT WITH ALLOYING CONSTITUENTS CONCENTRATED ALONG GRAIN BOUNDARIES, REHEATING SAID STEEL TO NOT LESS THAB THE ACM TEMPERATURE, TO DISOLVE THE ALLOYING CONSTITUENTS WITHIN THE AUSTENITIC MATRIC, AND THEREAFER COOLING TO A TEMPERATURENO HIGHER THAN NORMAL ROOM TEMPERATURE TO FORM A FINE GRAIN STRUCTURE WITH HOMOGENEOUS DISTRIBUTION OF ALLOYING CONSTITUENTS IN THE MATRIX.
References Cited (Backward Citations)
US2506558A
Cited
US2825669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-29 | 1966-04-30 | 1966-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-29 | 1970-04-30 | 1970-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-29 | 1974-04-30 | 1974-10-30 | $7700.00 | Window Closed / Lapsed |