Patent US2913806A successfully refreshed from Google Patents.
US2913806A
Expired / Lapsed
US
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Fabrication of heat transfer units
Assignee: Individual
•
Filing: 1954-11-22
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Granted: 1959-11-24
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Expires: 1974-11-22
Abstract
No abstract record available.
Inventors
- 👤 Richard W Kritzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:04
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/08; B21D53/085; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/51; Y10T29/5188; Y10T83/00; Y10T83/929; Y10T83/9314
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US891516A
Cited
US1044283A
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US2057244A
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US2224549A
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US2475187A
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US2558952A
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US2685362A
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US2761195A
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US2634974A
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US2688178A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-23 | 1963-05-25 | 1963-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-23 | 1967-05-25 | 1967-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-23 | 1971-05-25 | 1971-11-24 | $7700.00 | Window Closed / Lapsed |