US2481490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for spacing and fixing fins on tubes
Assignee: KEEPRITE Corp
•
Filing: 1947-05-05
•
Granted: 1949-09-13
•
Expires: 1967-05-05
Abstract
No abstract record available.
Inventors
- 👤 Frank M Bennett
- 👤 Carl J Weaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:12
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; Y10T29/53; Y10T29/53113; Y10T29/53122
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US485691A
Cited
GB189817085A
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US1469565A
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US1760038A
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US2023738A
Cited
US2085339A
Cited
US2379973A
Cited
US2338055A
Cited
US2438060A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-12 | 1953-03-14 | 1953-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-12 | 1957-03-14 | 1957-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-12 | 1961-03-14 | 1961-09-13 | $7700.00 | Window Closed / Lapsed |