Patent US2686524A successfully refreshed from Google Patents.
US2686524A
Expired / Lapsed
US
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Nozzle-type filter for use in pipes or cigarette holders
Assignee: Individual
•
Filing: 1950-08-24
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Granted: 1954-08-17
•
Expires: 1970-08-24
Abstract
No abstract record available.
Inventors
- 👤 Sr Robert E Kershaw
- 👤 Jr Thomas F Irvine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:29
CPC Classifications
A; A24; A24F; A24F1/00; A24F2700/00; A24F2700/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US56997A
Cited
US548203A
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US1236545A
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US1582971A
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FR606091A
Cited
US2024865A
Cited
US2003373A
Cited
US2245019A
Cited
US2362891A
Cited
US2544206A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-16 | 1958-02-15 | 1958-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-16 | 1962-02-15 | 1962-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-16 | 1966-02-15 | 1966-08-17 | $7700.00 | Window Closed / Lapsed |