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Patent US3539770A successfully refreshed from Google Patents.
US3539770A
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US
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Electric infrared heater
Assignee: BARBER Manufacturing Co
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Filing: 1967-11-14
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Granted: 1970-11-10
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Expires: 1987-11-14
Abstract
No abstract record available.
Inventors
- 👤 Donald C Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:58
CPC Classifications
F; F24; F24C; F24C7/00; F24C7/06; F24C7/062; F24C7/065; H; H05; H05B; H05B3/00; H05B3/0033; H05B3/009
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA638250A
Cited
US1855507A
Cited
US1954128A
Cited
GB485104A
Cited
US2196484A
Cited
GB864559A
Cited
US3275874A
Cited
US3345498A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |