US3426837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealed recirculating cooling system
Assignee: Sun Steel Treating Inc
•
Filing: 1966-12-27
•
Granted: 1969-02-11
•
Expires: 1986-12-27
Abstract
No abstract record available.
Inventors
- 👤 George E Moore
- 👤 Al E Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:36
CPC Classifications
F; F27; F27D; F27D11/00; C; C21; C21D; C21D1/00; C21D1/34; C21D1/44; C21D1/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1405281A
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US1679489A
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DE937117C
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US2441416A
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US2499782A
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US2654581A
Cited
US2796451A
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US3059913A
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US3108633A
Cited
US3202356A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |