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US2658982A
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Heating circuit and method
Assignee: United States Steel Corp
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Filing: 1952-02-19
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Granted: 1953-11-10
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Expires: 1972-02-19
Abstract
No abstract record available.
Inventors
- 👤 George H Rendel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:36
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/56; C21D9/62; C23; C23C; C23C2/00; C23C2/26; C23C2/28; C25; C25D; C25D5/00; C25D5/48; C25D5/50; C25D5/505
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1718806A
Cited
US2457870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |