Patent US2251664A successfully refreshed from Google Patents.
US2251664A
Expired / Lapsed
US
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Liquid circulating system
Assignee: Individual
•
Filing: 1936-06-20
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Granted: 1941-08-05
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Expires: 1956-06-20
Abstract
No abstract record available.
Inventors
- 👤 Francis W Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:22
CPC Classifications
B; B62; B62D; B62D5/00; B62D5/06; B62D5/062; F; F15; F15B; F15B1/00; F15B1/26; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2579; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7835; Y10T137/8593; Y10T137/85954; Y10T137/85978; Y10T137/86035; Y10T137/86043; Y10T137/86284; Y10T137/86292; Y10T137/86324
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-08-04 | 1945-02-03 | 1945-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-08-04 | 1949-02-03 | 1949-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-08-04 | 1953-02-03 | 1953-08-05 | $7700.00 | Window Closed / Lapsed |