Patent US3946768A successfully refreshed from Google Patents.
Patent US2763470A successfully refreshed from Google Patents.
US2763470A
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US
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Heat exchanger fin fastener
Assignee: Individual
•
Filing: 1955-03-04
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Granted: 1956-09-18
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Expires: 1975-03-04
Abstract
No abstract record available.
Inventors
- 👤 George M Certain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:26
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/34; F28F1/36; B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/22; B21C37/26; Y; Y10; Y10S; Y10S165/00; Y10S165/51; Y10S165/518; Y10S165/524; Y10S165/525
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1972230A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-18 | 1960-03-19 | 1960-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-18 | 1964-03-19 | 1964-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-18 | 1968-03-19 | 1968-09-18 | $7700.00 | Window Closed / Lapsed |