US3426667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air intake apparatus
Assignee: ENTELCO Corp A OHIO CORP
•
Filing: 1967-03-17
•
Granted: 1969-02-11
•
Expires: 1987-03-17
Abstract
No abstract record available.
Inventors
- 👤 Edward H Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:28
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/08; F24F7/00; F24F7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1394735A
Cited
US2201437A
Cited
US2566156A
Cited
US2737876A
Cited
US2868106A
Cited
US3216161A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |