Patent US3596665A successfully refreshed from Google Patents.
US3596665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tobacco smoke filter
Assignee: Individual
•
Filing: 1970-03-04
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Granted: 1971-08-03
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Expires: 1990-03-04
Abstract
Abstract A frangible tobacco smoke filter composed of a resilient tubular casing and a unit consisting of interconnected, opposed seals. When the smoker applies pressure to the casing, the unit is broken thereby allowing for passage of the tobacco smoke through a smoke-treating medium contained within the casing.
Inventors
- 👤 Knud Lindgard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:26
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/061
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
20 words
A filter element according to claim 1 wherein the seals are discs, each disc having at lease one curved surface.
Claim 2
Dependent Claim
16 words
A filter element according to claim 1 and including upstream and downstream of said spool unit.
Claim 3
Dependent Claim
15 words
A filter element according to claim 1 wherein the casing is constructed of plastic film.
Claim 4
Dependent Claim
13 words
A filter element according to claim 1 wherein the casing is foam-textured material.
Claim 5
Dependent Claim
14 words
A filter element according to claim 1 wherein the smoke-treating medium is a sorbent.
Claim 6
Dependent Claim
16 words
A filter element according to claim 1 wherein the smoke-treating medium consists of moisturized carbon particles.
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |