US2689905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid heater
Assignee: Individual
•
Filing: 1953-04-02
•
Granted: 1954-09-21
•
Expires: 1973-04-02
Abstract
No abstract record available.
Inventors
- 👤 Willis F Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:04
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/18; F24H1/20; F24H1/201; F24H1/202; Y; Y10; Y10T; Y10T137/00; Y10T137/6416; Y10T137/6606; Y10T137/8593; Y10T137/86187; Y10T137/86228
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |