US2620430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water pipe heater
Assignee: Individual
•
Filing: 1951-03-07
•
Granted: 1952-12-02
•
Expires: 1971-03-07
Abstract
No abstract record available.
Inventors
- 👤 Carl R Trowbridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:50
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/22; F; F16; F16L; F16L53/00; F16L53/30; F16L53/35; F16L53/38; H05B3/02; H05B3/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1316190A
Cited
US1015923A
Cited
US1408196A
Cited
US2523876A
Cited
US2426976A
Cited
US2447960A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |