Patent US3066077A successfully refreshed from Google Patents.
Patent US2106642A successfully refreshed from Google Patents.
US2106642A
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US
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Circulating heater
Assignee: TENNESSEE STOVE WORKS
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Filing: 1935-12-13
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Granted: 1938-01-25
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Expires: 1955-12-13
Abstract
No abstract record available.
Inventors
- 👤 George D Matthews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:25
CPC Classifications
F; F24; F24B; F24B7/00; F24B7/02; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/0801; Y10T292/0824; Y10T292/0876; Y10T292/0883; Y10T292/0884; Y10T292/175; Y10T292/19
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) | 1941-01-24 | 1941-07-26 | 1942-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-01-24 | 1945-07-26 | 1946-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-01-24 | 1949-07-26 | 1950-01-25 | $7700.00 | Window Closed / Lapsed |