Patent US3162249A successfully refreshed from Google Patents.
US2981172A
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Updraft ventilator and magnetic damper catch therefor
Assignee: Individual
•
Filing: 1959-01-22
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Granted: 1961-04-25
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Expires: 1979-01-22
Abstract
No abstract record available.
Inventors
- 👤 John S Kalman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:09
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F24F13/1413; F04; F04D; F04D25/00; F04D25/02; F04D25/08; F04D25/12; F04D25/14; F24F13/1426; F24F13/1406; F24F2013/148; Y; Y10; Y10S; Y10S454/00; Y10S454/904
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) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |