US2845284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat exchanger coupling utilizing both a lock and a lap seam
Assignee: Modine Manufacturing Co
•
Filing: 1953-09-17
•
Granted: 1958-07-29
•
Expires: 1973-09-17
Abstract
No abstract record available.
Inventors
- 👤 Einar V Kallstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:53
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21D53/04; F; F22; F22G; F22G3/00; F22G3/009; F28; F28F; F28F9/00; F28F9/02; F28F9/04; F28F9/16; F28F9/18; F28F9/182; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49391
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US232259A
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US1989614A
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US2137097A
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US2483412A
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US2727536A
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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) | 1961-07-28 | 1962-01-27 | 1962-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-28 | 1966-01-27 | 1966-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-28 | 1970-01-27 | 1970-07-29 | $7700.00 | Window Closed / Lapsed |