US2853277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tube sheet and leakage detection construction for heat exchanger
Assignee: Griscom Russell Co
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Filing: 1956-04-16
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Granted: 1958-09-23
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Expires: 1976-04-16
Abstract
No abstract record available.
Inventors
- 👤 Jr Frank Boni
- 👤 Karl A Gardner
- 👤 Philip S Otten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:10
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/10; F28D7/12; F22; F22B; F22B1/00; F22B1/02; F22B1/06; F22B1/063; F22B1/066; F22G; F22G3/00; F22G3/009; F28F; F28F9/00; F28F9/02; F28F9/0229; G; G21; G21C; G21C17/00; G21C17/002; F28F2265/00; F28F2265/16; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10S; Y10S165/00; Y10S165/001; Y10S165/008
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB375132A
Cited
US1948550A
Cited
US2187555A
Cited
US2280098A
Cited
US2475025A
Cited
US2559646A
Cited
US2743089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-22 | 1962-03-24 | 1962-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-22 | 1966-03-24 | 1966-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-22 | 1970-03-24 | 1970-09-23 | $7700.00 | Window Closed / Lapsed |