US3618302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unitary portable air cleaner
Assignee: Individual
•
Filing: 1969-10-17
•
Granted: 1971-11-09
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Expires: 1989-10-17
Abstract
Abstract AN AIR CLEANER THAN EMBODIED A CLOSED SYSTEM COMPRISING A CENTRIGUGAL DUST SEPARATOR WITH AN INTERNAL SPARK ARRESTER CONSTITUTING A PRE-CLEANER, AND AN AFTER FILTER THAT RECIRCULATES THE AIR DISCHARGED FROM THE PRE-CLEANER AND WHICH FURTHER CLEANS SAID RECIRCULATED AIR BEFORE DIRECTING SAID CLEANED AIR TO THE INLET OF THE CENTRIFUGAL DUST SEPARATOR.
Inventors
- 👤 Milan S Cornett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:04
CPC Classifications
B; B04; B04C; B04C9/00; B04C2009/002; B04C2009/005; Y; Y10; Y10S; Y10S55/00; Y10S55/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |