Patent US2606992A successfully refreshed from Google Patents.
US2606992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air heater
Assignee: Individual
•
Filing: 1950-03-27
•
Granted: 1952-08-12
•
Expires: 1970-03-27
Abstract
No abstract record available.
Inventors
- 👤 Harry F Macdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:29
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1170166A
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DE480517C
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US1038410A
Cited
CH79611A
Cited
US1464255A
Cited
US1651890A
Cited
US2007222A
Cited
US1998916A
Cited
US2367170A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-08-12 | 1956-02-11 | 1956-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-12 | 1960-02-11 | 1960-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-12 | 1964-02-11 | 1964-08-12 | $7700.00 | Window Closed / Lapsed |