Patent US2702504A successfully refreshed from Google Patents.
US2702504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air duct control means
Assignee: Individual
•
Filing: 1952-04-16
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Granted: 1955-02-22
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Expires: 1972-04-16
Abstract
No abstract record available.
Inventors
- 👤 Joseph R Guildford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:11
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F13/10; F24F13/14; F24F13/1426; B; B01; B01D; B01D1/00; B01D1/14; F24F13/1486
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1395784A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-21 | 1958-08-23 | 1959-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-21 | 1962-08-23 | 1963-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-21 | 1966-08-23 | 1967-02-22 | $7700.00 | Window Closed / Lapsed |