Patent US4100207A successfully refreshed from Google Patents.
Patent US3370592A successfully refreshed from Google Patents.
US3370592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indicating cigarette filter
Assignee: P Lorillard Co
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Filing: 1965-11-12
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Granted: 1968-02-27
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Expires: 1985-11-12
Abstract
No abstract record available.
Inventors
- 👤 Frederick J Schultz
- 👤 Clifford O Jensen
- 👤 Albert B Hudson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:32
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; A; A24; A24D; A24D3/00; A24D3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A FILTER FOR TOBACCO PRODUCTS COMPRISING A PLUG OF POROUS ABSORBENT MATERIAL CONTAINING AN INDICATOR ADDITIVE INCORPORATED THEREIN WHICH CHANGES COLOR IN THE PRESENCE OF A SIGNIFICANT AMOUNT OF A SELECTED COMPONENT OF TOBACCO SMOKE, A TRANSPARENT WRAPPER AROUND SAID PLUG AND A WRAPPER OF SUBSTANTIALLY OPAQUE PAPER OVERLYING SAID TRANSPARENT WRAPPER AND HAVING AN OPENING THEREIN FOR VIEWING SAID PLUG AND THE CHANGE OF COLOR THEREOF.
Claim 2
Dependent Claim
67 words
A FILTER FOR TOBACCO PRODUCTS COMPRISING A PLUG OF POROUS ABSORBENT MATERIAL CONTAINING AN INDICATOR ADDITIVE INCORPORATED THEREIN WHICH CHANGES COLOR IN THE PRESENCE OF A SIGNIFICANT AMOUNT OF A SELECTED COMPONENT OF TOBACCO SMOKE, A TRANSPARENT WRAPPER AROUND SAID PLUG AND A WRAPPER OF SUBSTANTIALLY OPAQUE PAPER OVERLYING SAID TRANSPARENT WRAPPER AND HAVING AN OPENING THEREIN FOR VIEWING SAID PLUG AND THE CHANGE OF COLOR THEREOF.
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) | 1971-02-26 | 1971-08-28 | 1972-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-26 | 1975-08-28 | 1976-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-26 | 1979-08-28 | 1980-02-27 | $7700.00 | Window Closed / Lapsed |