US3472238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tar removing cigarette holder and disposable filter cartridge therefor
Assignee: L & L Lab
•
Filing: 1967-05-08
•
Granted: 1969-10-14
•
Expires: 1987-05-08
Abstract
No abstract record available.
Inventors
- 👤 Lester L Blount
- 👤 Leonard L Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:58
CPC Classifications
A; A24; A24F; A24F13/00; A24F13/02; A24F13/04; A24F13/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US214586A
Cited
US332858A
Cited
US603702A
Cited
GB191201809A
Cited
US2954772A
Cited
US3163168A
Cited
US3343547A
Cited
US3318316A
Cited
US3367343A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |