US3201772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter obstruction signal arrangement for air conditioning apparatus
Assignee: General Electric Co
•
Filing: 1961-12-22
•
Granted: 1965-08-17
•
Expires: 1981-12-22
Abstract
No abstract record available.
Inventors
- 👤 William T Ladusaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:35
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/30; F24F11/32; F24F11/39; B; B01; B01D; B01D46/00; B01D46/10; F24F13/00; F24F13/20; F24F8/00; F24F8/10; F24F8/108; Y; Y10; Y10S; Y10S116/00; Y10S116/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US886355A
Cited
US2789175A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |