Patent US2683448A successfully refreshed from Google Patents.
US2683448A
Expired / Lapsed
US
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Rotary mechanical heater
Assignee: LEONARD J WOLF
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Filing: 1951-07-12
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Granted: 1954-07-13
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Expires: 1971-07-12
Abstract
No abstract record available.
Inventors
- 👤 Smith John Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:56
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/58; F04D29/582; F24; F24V; F24V40/00
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) | 1957-07-12 | 1958-01-11 | 1958-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-12 | 1962-01-11 | 1962-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-12 | 1966-01-11 | 1966-07-13 | $7700.00 | Window Closed / Lapsed |