US2420175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric water heater
Assignee: Individual
•
Filing: 1945-07-11
•
Granted: 1947-05-06
•
Expires: 1965-07-11
Abstract
No abstract record available.
Inventors
- 👤 Robert A Johnstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:24
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/10; F24H1/12; F24H1/14; F24H1/16; F24H1/162
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US678314A
Cited
US1005395A
Cited
US1210691A
Cited
US1370619A
Cited
US1418011A
Cited
US1847489A
Cited
US2116896A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-05 | 1950-11-04 | 1951-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-05 | 1954-11-04 | 1955-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-05 | 1958-11-04 | 1959-05-06 | $7700.00 | Window Closed / Lapsed |