Patent US2449538A successfully refreshed from Google Patents.
US2449538A
Expired / Lapsed
US
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Control apparatus
Assignee: Hubbard and Co
•
Filing: 1943-07-27
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Granted: 1948-09-21
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Expires: 1963-07-27
Abstract
No abstract record available.
Inventors
- 👤 Harold S Ackerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:29
CPC Classifications
F; F24; F24C; F24C3/00; F24C3/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2115988A
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US2065634A
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US2202197A
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US2236624A
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US2230137A
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US2272492A
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US2327690A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-21 | 1952-03-22 | 1952-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-21 | 1956-03-22 | 1956-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-21 | 1960-03-22 | 1960-09-21 | $7700.00 | Window Closed / Lapsed |