US3398263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High wall incandescent electric heater
Assignee: Markel Electric Products Inc
•
Filing: 1965-02-24
•
Granted: 1968-08-20
•
Expires: 1985-02-24
Abstract
No abstract record available.
Inventors
- 👤 Ralph G Ortiz
- 👤 Grant Cuthbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:24
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/16; F; F24; F24C; F24C7/00; F24C7/06; F24C7/062; F24C7/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1542967A
Cited
US1688168A
Cited
US1724585A
Cited
US1850616A
Cited
GB485004A
Cited
US2232492A
Cited
US2694765A
Cited
US2879369A
Cited
US3217139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |