US2691508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Floating head assembly for shell and tube type coolers or heat exchangers
Assignee: Pure Oil Co
•
Filing: 1950-12-26
•
Granted: 1954-10-12
•
Expires: 1970-12-26
Abstract
No abstract record available.
Inventors
- 👤 Jesse M Hatfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:44
CPC Classifications
F; F28; F28D; F28D7/00; F28D7/16; F28F; F28F9/00; F28F9/02; F28F9/0236; F28F9/0239; F28F2230/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49373
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US512973A
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US2087403A
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US2292524A
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US2441353A
Cited
US2488807A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-11 | 1958-04-12 | 1958-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-11 | 1962-04-12 | 1962-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-11 | 1966-04-12 | 1966-10-12 | $7700.00 | Window Closed / Lapsed |