US3399515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cleaner
Assignee: Vortox Manufacturing Co
•
Filing: 1966-04-22
•
Granted: 1968-09-03
•
Expires: 1986-04-22
Abstract
No abstract record available.
Inventors
- 👤 Charles W Hahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:58
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/022; Y; Y10; Y10S; Y10S493/00; Y10S493/941
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1702804A
Cited
US1864201A
Cited
US2417130A
Cited
FR63092E
Cited
US2894600A
Cited
FR1278115A
Cited
US3078650A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-03 | 1972-03-04 | 1972-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-03 | 1976-03-04 | 1976-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-03 | 1980-03-04 | 1980-09-03 | $7700.00 | Window Closed / Lapsed |