Patent US3097980A successfully refreshed from Google Patents.
US3097980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat treatment of stainless steel
Assignee: Hamilton Watch Co
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Filing: 1957-08-22
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Granted: 1963-07-16
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Expires: 1977-08-22
Abstract
No abstract record available.
Inventors
- 👤 Swarr John Howard
- 👤 Leon A Hurwitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:10
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/0068; C21D6/00; C21D6/04; C21D1/00; C21D1/18; C21D1/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A PROCESS FOR HEAT TREATING A SERIES OF MARTENSITIC STAINLESS STEEL PARTS OF SLIGHTLY VARYING SIZES TO BRING ALL PARTS TO SUBSTANTIALLY THE SAME SIZE WITHIN SPECIFIED TOLERANCES COMPRISING PREPARING A RECORD OF VARIATION IN LINEAR DIMENSIONS OF SAID PARTS AT THE COMPLETION OF THE FOLLOWING RECITED PROCESS AS A FUNCTION OF SOLUTION HEATING AT DIFFERENT TEMPERATURES, AND CARRYING OUT THE FOLLOWING STEPS WHICH ARE RECITED IN REVERSE ORDER: STRESS RELIEVING ALL SAID PARTS AT SUBSTANTIALLY THE SAME TEMPERATURE WITHIN THE RANGE OF 300-600* F., CHILLING ALL SAID PARTS TO AT LEAST AS LOW AS -100* F., SOLUTION HEATING PARTS OF DIFFERENT SIZES AT DIFFERENT TEMPERATURES WITHIN THE RANGE OF ABOUT 1700-2100* F. WHICH SAID RECORD INDICATES WILL CAUSE DIMENSIONAL CHANGES TO BRING ALL SAID PARTS WITHIN TOLERANCE.
Claim 2
Dependent Claim
128 words
A PROCESS FOR HEAT TREATING A SERIES OF MARTENSITIC STAINLESS STEEL PARTS OF SLIGHTLY VARYING SIZES TO BRING ALL PARTS TO SUBSTANTIALLY THE SAME SIZE WITHIN SPECIFIED TOLERANCES COMPRISING PREPARING A RECORD OF VARIATION IN LINEAR DIMENSIONS OF SAID PARTS AT THE COMPLETION OF THE FOLLOWING RECITED PROCESS AS A FUNCTION OF SOLUTION HEATING AT DIFFERENT TEMPERATURES, AND CARRYING OUT THE FOLLOWING STEPS WHICH ARE RECITED IN REVERSE ORDER: STRESS RELIEVING ALL SAID PARTS AT SUBSTANTIALLY THE SAME TEMPERATURE WITHIN THE RANGE OF 300-600* F., CHILLING ALL SAID PARTS TO AT LEAST AS LOW AS -100* F., SOLUTION HEATING PARTS OF DIFFERENT SIZES AT DIFFERENT TEMPERATURES WITHIN THE RANGE OF ABOUT 1700-2100* F. WHICH SAID RECORD INDICATES WILL CAUSE DIMENSIONAL CHANGES TO BRING ALL SAID PARTS WITHIN TOLERANCE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-07-15 | 1967-01-14 | 1967-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-15 | 1971-01-14 | 1971-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-15 | 1975-01-14 | 1975-07-16 | $7700.00 | Window Closed / Lapsed |