Patent US3889691A successfully refreshed from Google Patents.
US3889691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tobacco smoke filter
Assignee: Calgon Carbon Corp
•
Filing: 1973-12-21
•
Granted: 1975-06-17
•
Expires: 1993-12-21
Abstract
Abstract An improved tobacco smoke filter material for removing HCN from tobacco smoke is provided which comprises activated carbon impregnated with an effective quantity of cuprous chloride.
Inventors
- 👤 John Emery Urbanic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:20
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/16; A24D3/163
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
41 words
THE METHOD OF REMOVING HCN FROM TOBACCO SMOKE WHICH COMPRISES CONTACTING SAID TOBACCO SMOKE WITH A TOBACCO SMOKE FILTERING MATERIAL COMPRISING AT LEAST ABOUT 50 MILLIGRAMS OF GRANULAR ACTIVATED CARBON IMPREGNATED WITH 0.5 TO 15 PERCENT BY WEIGHT OF CUPROUS CHLORIDE.
Claim 2
Independent Claim
41 words
THE METHOD OF REMOVING HCN FROM TOBACCO SMOKE WHICH COMPRISES CONTACTING SAID TOBACCO SMOKE WITH A TOBACCO SMOKE FILTERING MATERIAL COMPRISING AT LEAST ABOUT 50 MILLIGRAMS OF GRANULAR ACTIVATED CARBON IMPREGNATED WITH 0.5 TO 15 PERCENT BY WEIGHT OF CUPROUS CHLORIDE.
Claim 3
Dependent Claim
32 words
The method of claim 1 wherein said granular activated carbon has a mesh size between 4 and 40 mesh and is impregnated with 0.5 to 15 percent by weight of cuprous chloride.
Claim 4
Dependent Claim
62 words
A smoking article having a burnable tobacco charge, a mouth end and a filter element interposed between said burnable tobacco charge and said mouth end, said filter elememt containing a tobacco smoke filtering material capable of removing HCN from tobacco smoke comprising at least about 50 milligrams of granular activated carbon impregnated with 0.5 - 15 percent by weight of cuprous chloride.
Claim 5
Dependent Claim
62 words
A smoking article having a burnable tobacco charge, a mouth end and a filter element interposed between said burnable tobacco charge and said mouth end, said filter elememt containing a tobacco smoke filtering material capable of removing HCN from tobacco smoke comprising at least about 50 milligrams of granular activated carbon impregnated with 0.5 - 15 percent by weight of cuprous chloride.
Claim 6
Dependent Claim
13 words
The smoking article of claim 3 wherein said smoking article is a cigarette.
Claim 7
Dependent Claim
33 words
The smoking article of claim 4 wherein said granular activated carbon has a mesh size between 4 and 40 mesh and is impregnated with 0.5 to 15 percent by weight of cuprous chloride.
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) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |