US2439673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air volume controller
Assignee: Manning Maxwell and Moore Inc
•
Filing: 1944-06-12
•
Granted: 1948-04-13
•
Expires: 1964-06-12
Abstract
No abstract record available.
Inventors
- 👤 Charles G Roper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:21
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/04; G05D16/12; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3115; Y10T137/3127; Y10T137/313; Y10T137/3133; Y10T137/7287; Y10T137/7358; Y10T137/7439; Y10T137/7485
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US627561A
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US1283581A
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US1385058A
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US1433129A
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US1549786A
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US1844528A
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US1910707A
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US2107564A
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US2121549A
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US2186833A
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US2348110A
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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) | 1951-04-13 | 1951-10-13 | 1952-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-13 | 1955-10-13 | 1956-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-13 | 1959-10-13 | 1960-04-13 | $7700.00 | Window Closed / Lapsed |