Patent DE620083C successfully refreshed from Google Patents.
US3608561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extender means for attachment of an auxiliary cigarette filter
Assignee: H-2-0 FILTER CORP
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Filing: 1970-01-15
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Granted: 1971-09-28
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Expires: 1990-01-15
Abstract
Abstract This invention relates to extender means for optional attachment of an auxiliary cigarette filter to a conventional cigarette. The extender means comprises a tubular body having ridges on its internal surface. Each said ridge defines dual vertices creating an air duct therebetween to rarify the smoke drawn through the cigarette.
Inventors
- 👤 Mortimer Russel Dock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:31
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/04; A24D3/043
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
In a filter extender housing for optional attachment of an independent filter to the end of a cigarette, a tubular body having internal ridges on its inner surface and containing space in one end portion for filtering means, and providing in the opposite end a receptacle for the receipt of the filter end of a conventional cigarette, such filter end being brought into direct abutment with the filter means embodied in the said extender housing, wherEin each of said ridges defines dual, closely spaced vertices, creating an air duct therebetween to effect rarefication of the smoke drawn through said device, said ridges being spaced apart from each other a distance substantially greater than the spacing between said vertices.
Claim 2
Dependent Claim
118 words
In a filter extender housing for optional attachment of an independent filter to the end of a cigarette, a tubular body having internal ridges on its inner surface and containing space in one end portion for filtering means, and providing in the opposite end a receptacle for the receipt of the filter end of a conventional cigarette, such filter end being brought into direct abutment with the filter means embodied in the said extender housing, wherEin each of said ridges defines dual, closely spaced vertices, creating an air duct therebetween to effect rarefication of the smoke drawn through said device, said ridges being spaced apart from each other a distance substantially greater than the spacing between said vertices.
Claim 3
Dependent Claim
14 words
The invention of claim 1, wherein said housing is fabricated of resilient, waterproof material.
Claim 4
Dependent Claim
23 words
The invention of claim 1, wherein said internal ridges, being parallel, are longitudinally disposed at spaced-apart intervals upon the interior of said housing.
Claim 5
Dependent Claim
21 words
The invention of claim 1, wherein said internal ridges, being parallel, follow a helical path upon the interior of said housing.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |