Patent US2633071A successfully refreshed from Google Patents.
US2633071A
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US
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Lock for ventilator dampers
Assignee: Individual
•
Filing: 1950-09-07
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Granted: 1953-03-31
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Expires: 1970-09-07
Abstract
No abstract record available.
Inventors
- 👤 Albert L Erickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:11
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/0001; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F24F13/1426; F24F13/1486
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US621551A
Cited
US941771A
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US1810831A
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US2052596A
Cited
US2174373A
Cited
US2328332A
Cited
US2367454A
Cited
US2443279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-30 | 1956-09-29 | 1957-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-30 | 1960-09-29 | 1961-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-30 | 1964-09-29 | 1965-03-31 | $7700.00 | Window Closed / Lapsed |