US2813964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric hot water house heating systems and novel preheaters and tanks for hot water
Assignee: Individual
•
Filing: 1956-08-20
•
Granted: 1957-11-19
•
Expires: 1976-08-20
Abstract
No abstract record available.
Inventors
- 👤 Ralph G Cerulli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:43
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/10; F24H1/101; F24H1/102
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1215703A
Cited
US1258642A
Cited
US1408502A
Cited
US1692741A
Cited
US1661693A
Cited
US1640049A
Cited
US1696758A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-18 | 1961-05-20 | 1961-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-18 | 1965-05-20 | 1965-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-18 | 1969-05-20 | 1969-11-19 | $7700.00 | Window Closed / Lapsed |