US2552847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air handling apparatus
Assignee: Farr Co
•
Filing: 1948-11-22
•
Granted: 1951-05-15
•
Expires: 1968-11-22
Abstract
No abstract record available.
Inventors
- 👤 Richard S Farr
- 👤 Richard B Esselman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:27
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/02; F16L55/033; F16L55/0336; B; B01; B01D; B01D46/00; B01D46/10; B01D46/12; B01D46/121
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2205831A
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US2075384A
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US2356757A
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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) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |