Patent US4198530A successfully refreshed from Google Patents.
Patent US2892702A successfully refreshed from Google Patents.
US2892702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hardenable stainless steel
Assignee: United States Steel Corp
•
Filing: 1955-01-04
•
Granted: 1959-06-30
•
Expires: 1975-01-04
Abstract
No abstract record available.
Inventors
- 👤 Carl S Walton
- 👤 William F White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:13
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A STAINLESS STEEL CHARACTERIZED BY A HARDNESS VALUE OF LESS THAN 95 RB AFTER SOLUTION AMEALING AND AIR COOLING AND SUSCEPTIBLE TO PHASE TRANSFORMATION AND AGEHARDENING BY DOUBLE THERMAL TREATMENT TO A HARDNESS VALUE OF AT LEAST RC 38 CONTAINING BETWEEN 0.5 AND 0.8% CARBON, 16.0 TO 17.5% CHROMIUM, 5.50 TO 6.75% NICKEL, .90 TO 1.80% ALUMINUM, .12 TO .18E NITROGEN AND THE BALANCE IRON AND OTHER ELEMENTS IN AMOUNTS WHICH DO NOT ADVERSELY AFFECTED FROM THE PROPERTIES.
Claim 2
Dependent Claim
78 words
A STAINLESS STEEL CHARACTERIZED BY A HARDNESS VALUE OF LESS THAN 95 RB AFTER SOLUTION AMEALING AND AIR COOLING AND SUSCEPTIBLE TO PHASE TRANSFORMATION AND AGEHARDENING BY DOUBLE THERMAL TREATMENT TO A HARDNESS VALUE OF AT LEAST RC 38 CONTAINING BETWEEN 0.5 AND 0.8% CARBON, 16.0 TO 17.5% CHROMIUM, 5.50 TO 6.75% NICKEL, .90 TO 1.80% ALUMINUM, .12 TO .18E NITROGEN AND THE BALANCE IRON AND OTHER ELEMENTS IN AMOUNTS WHICH DO NOT ADVERSELY AFFECTED FROM THE PROPERTIES.
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) | 1962-06-29 | 1962-12-29 | 1963-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-29 | 1966-12-29 | 1967-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-29 | 1970-12-29 | 1971-06-30 | $7700.00 | Window Closed / Lapsed |