US3242017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for heat treating annular castings
Assignee: Amsted Industries Inc
•
Filing: 1963-05-03
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Granted: 1966-03-22
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Expires: 1983-05-03
Abstract
No abstract record available.
Inventors
- 👤 Jr William N Heflin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:59
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/34
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
67 words
A METHOD OF TREATING A CAST STEEL ARTICLE WHICH INCLUDES PORTIONS OF DIFFERENT THICKNESSES, COMPRISING HEATING THE ARTICLE TO APPROXIMATELY 1550* TO 1600*F., COOLING ALL PORTIONS OF THE ARTICLE AT A SUBSTANTIALLY EQUAL RATE TO BETWEEN APPROXIMATELY 400* TO 700*F., AGAIN HEATING THE ARTICLE TO APPROXIMATELY 900*., AND THEREAFTER AGAIN COOLING ALL PORTIONS OF THE ARTICLE AT A SUBSTANTIALLY EQUAL RATE TO BETWEEN APPROXIMATELY 400* TO 700*F.
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US2535110A
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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) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |