US3630210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smoking articles
Assignee: Brown and Williamson Holdings Inc
•
Filing: 1969-09-19
•
Granted: 1971-12-28
•
Expires: 1989-09-19
Abstract
Abstract A smoking article or attachment is provided with means by which a puff is divided automatically into a first portion and at least one later portion and the smoke portions produced are differentially and/or separately filtered. The puff-dividing means may be a valve device subject to the suction produced by the puff and arranged to control the opening of a smoke passage additional to a constantly open smoke passage. The constantly open passage opens into a high-density filter region and the additional passage into a lower-density filter region.
Inventors
- 👤 Fred Haslam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:43
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/04; A24D3/041
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
The filter device of claim 1 in which the first filter region is of high density and the second filter region is of lower density.
Claim 2
Dependent Claim
30 words
The filter device of claim 1 in which the additional passage embodying the valve is provided with axially spaced radial ports leading to a substantially annular passage bypassing the valve.
References Cited (Backward Citations)
US1543043A
Cited
US2890703A
Cited
US2850021A
Cited
GB1094642A
Cited
US3348553A
Cited
US3463166A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |