Patent US2705911A successfully refreshed from Google Patents.
US2705911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversibly driven ventilating fan
Assignee: Individual
•
Filing: 1953-12-21
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Granted: 1955-04-12
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Expires: 1973-12-21
Abstract
No abstract record available.
Inventors
- 👤 Sidney J Heiman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:14
CPC Classifications
F; F04; F04D; F04D25/00; F04D25/02; F04D25/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US661464A
Cited
US695938A
Cited
US1969981A
Cited
US1917327A
Cited
US2230612A
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US2456340A
Cited
US2476692A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-04-11 | 1958-10-11 | 1959-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-11 | 1962-10-11 | 1963-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-11 | 1966-10-11 | 1967-04-12 | $7700.00 | Window Closed / Lapsed |