Patent US5111897A successfully refreshed from Google Patents.
Patent US3545181A successfully refreshed from Google Patents.
US3545181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cleaning apparatus
Assignee: Individual
•
Filing: 1968-05-07
•
Granted: 1970-12-08
•
Expires: 1988-05-07
Abstract
No abstract record available.
Inventors
- 👤 Bernard W Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:20
CPC Classifications
E; E01; E01H; E01H1/00; E01H1/08; E01H1/0863; Y; Y10; Y10T; Y10T137/00; Y10T137/4238; Y10T137/4245; Y10T137/4273
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1620241A
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GB564599A
Cited
US2826321A
Cited
US2944629A
Cited
US2907404A
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GB941907A
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GB974415A
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US3221635A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-07 | 1974-06-08 | 1974-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-07 | 1978-06-08 | 1978-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-07 | 1982-06-08 | 1982-12-08 | $7700.00 | Window Closed / Lapsed |