Patent US3403690A successfully refreshed from Google Patents.
US3403690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filters for tobacco smoke
Assignee: Brown and Williamson Holdings Inc
•
Filing: 1967-03-07
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Granted: 1968-10-01
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Expires: 1987-03-07
Abstract
No abstract record available.
Inventors
- 👤 Horsewell Henry George
- 👤 Tolman Thomas William Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:13
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |