Patent US2621579A successfully refreshed from Google Patents.
US2621579A
Expired / Lapsed
US
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Damper
Assignee: Tuttle & Bailey Inc
•
Filing: 1949-08-25
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Granted: 1952-12-16
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Expires: 1969-08-25
Abstract
No abstract record available.
Inventors
- 👤 Ernest H Person
- 👤 Richard D Tutt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:17
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/06; F24F13/062
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1696922A
Cited
US1931156A
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US2077175A
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US2217479A
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US2317798A
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US2336765A
Cited
US2403291A
Cited
US2479773A
Cited
US2456312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |