US3463168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatically charged tobacco smoke filter
Assignee: ALAN N ALPERN
•
Filing: 1967-04-27
•
Granted: 1969-08-26
•
Expires: 1987-04-27
Abstract
No abstract record available.
Inventors
- 👤 John H Troll
- 👤 Alan N Alpern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:58
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/04; A24D3/046; A24F; A24F13/00; A24F13/02; A24F13/04; A24F13/06; Y; Y10; Y10S; Y10S55/00; Y10S55/39
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB433048A
Cited
US2740184A
Cited
US3079930A
Cited
US2990912A
Cited
US3087500A
Cited
US3240212A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-25 | 1973-02-24 | 1973-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-25 | 1977-02-24 | 1977-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-25 | 1981-02-24 | 1981-08-26 | $7700.00 | Window Closed / Lapsed |