US3089940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiant heater
Assignee: Thermel Inc
•
Filing: 1960-05-11
•
Granted: 1963-05-14
•
Expires: 1980-05-11
Abstract
No abstract record available.
Inventors
- 👤 William H Norton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:46
CPC Classifications
F; F24; F24C; F24C7/00; F24C7/06; F24C7/062; F24C7/065
Claims Analysis
Total Claims: 0
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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) | 1966-05-13 | 1966-11-12 | 1967-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-13 | 1970-11-12 | 1971-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-13 | 1974-11-12 | 1975-05-14 | $7700.00 | Window Closed / Lapsed |