US2507902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric water heater
Assignee: Individual
•
Filing: 1948-08-02
•
Granted: 1950-05-16
•
Expires: 1968-08-02
Abstract
No abstract record available.
Inventors
- 👤 Graves Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:52
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/0005; F24H9/001; F24H9/0015; F24H9/0021; F24H1/00; F24H1/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1953-05-15 | 1953-11-14 | 1954-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-15 | 1957-11-14 | 1958-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-15 | 1961-11-14 | 1962-05-16 | $7700.00 | Window Closed / Lapsed |