Patent US2768913A successfully refreshed from Google Patents.
US2768913A
Expired / Lapsed
US
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Cigarette filter tips from dextran
Assignee: Commonwealth Engineering Company of Ohio
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Filing: 1954-10-22
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Granted: 1956-10-30
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Expires: 1974-10-22
Abstract
No abstract record available.
Inventors
- 👤 Malvern J Hiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:32
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A FILTER FOR CLARIFYING AN EFFLUENT STREAM OF TOBACCO SMOKE AND COMPRISING A COHERENT MASS OF DISERETE PARTICLES OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF SUBSTANTIALLY WATER-INSOLUBLE DEXTRANS AND DEXTRAN DERIVATIVES, AT LEAST SOME OF THE PARTICLES BEING PLASTICIZED AND PARTICLES OF THE MASS BEING BONDED TOGETHER AT CONTIGUOUS SURFACES AND HAVING SPACES THEREBETWEEN DEFINING PASSAGES THAT MEANDER THROUGH THE FILTER AND ALONG WHICH THE EFFLUENT STREAM OF SMOKE PASSES IN CONTACT WITH THE PARTICLES.
Claim 2
Dependent Claim
77 words
A FILTER FOR CLARIFYING AN EFFLUENT STREAM OF TOBACCO SMOKE AND COMPRISING A COHERENT MASS OF DISERETE PARTICLES OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF SUBSTANTIALLY WATER-INSOLUBLE DEXTRANS AND DEXTRAN DERIVATIVES, AT LEAST SOME OF THE PARTICLES BEING PLASTICIZED AND PARTICLES OF THE MASS BEING BONDED TOGETHER AT CONTIGUOUS SURFACES AND HAVING SPACES THEREBETWEEN DEFINING PASSAGES THAT MEANDER THROUGH THE FILTER AND ALONG WHICH THE EFFLUENT STREAM OF SMOKE PASSES IN CONTACT WITH THE 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) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |