US3019854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter for heating and air conditioning ducts
Assignee: Individual
•
Filing: 1959-10-12
•
Granted: 1962-02-06
•
Expires: 1979-10-12
Abstract
No abstract record available.
Inventors
- 👤 Waitus A O'bryant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:31
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; F; F24; F24F; F24F13/00; F24F13/28; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49833
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1566607A
Cited
US2160003A
Cited
US2138736A
Cited
US2252724A
Cited
US2124370A
Cited
US2182501A
Cited
US2505175A
Cited
US2513946A
Cited
US2637540A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-05 | 1965-08-07 | 1966-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-05 | 1969-08-07 | 1970-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-05 | 1973-08-07 | 1974-02-06 | $7700.00 | Window Closed / Lapsed |