Patent US3319947A successfully refreshed from Google Patents.
US3319947A
Expired / Lapsed
US
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Portable space heaters
Assignee: CENTURY ENGINEERING CORP
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Filing: 1964-12-14
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Granted: 1967-05-16
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Expires: 1984-12-14
Abstract
No abstract record available.
Inventors
- 👤 Merlyn R Truesdell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:57
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0488; Y; Y02; Y02B; Y02B30/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2174663A
Cited
GB902893A
Cited
US3073583A
Cited
US3148956A
Cited
US3101193A
Cited
US3256003A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-05-15 | 1970-11-14 | 1971-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-15 | 1974-11-14 | 1975-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-15 | 1978-11-14 | 1979-05-16 | $7700.00 | Window Closed / Lapsed |