US3220418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cigarette
Assignee: SAMUEL L COHN
•
Filing: 1962-03-05
•
Granted: 1965-11-30
•
Expires: 1982-03-05
Abstract
No abstract record available.
Inventors
- 👤 Charles C Cohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:40
CPC Classifications
A; A24; A24D; A24D1/00; A24D1/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A CIGARETTE OR THE LIKE COMPRISING AS ELEMENTS A CYLINDRICAL COMBUSTIBLE WRAPPER CONTAINING TOBACCO AND A SHEATH EXTENDING CIRCUMFERENTIALLY AROUND SAID WRAPPER IN SPACED RELATION THERETO, SAID SHEATH BEING RELATIVELY NON-COMBUSTIBLE AS COMPARED WITH THE WRAPPER AND HAVING SMALL OPENINGS THEREIN TO PROVIDE FOR THE FLOW OF AIR TO THE BURNING ZONE OF THE CIGARETTE, AT LEST ONE OF SAID ELEMENTS HAVING APPLIED THERETO IN THE SPACE BETWEEN THE ELEMENTS AN INTUMESCENT SUBSTANCE, SAID INTUMESCENT SUBSTANCE COMPRISING DEPOSITS OF A SODIUM SILICATE SOLUTION HAVING A SODIUM TO SILICATE RATIO OF APPROXIMATELY 1:2 AND A BAUME READING OF APPROXIMATELY 59* AT 20*C., SAID DEPOSITS BEING DISTRIBUTED IN SPACED RELATION THROUGHOUT THE SURFACE OF THE ELEMENTS HAVING THE DEPOSITS APPLIED THERETO WHEREBY UNDER THE INFLUENCE OF THE HEAT OF BURNING OF THE WRAPPER SAID DEPOSITS WILL INTUMESCE TO SEPARATE SAID WRAPPER AND SAID SHEATH AND PROVIDE PASSAGEWAYS FOR THE SUPPLY OF COMBUSTION AIR FOR SUPPORTING COMBUSITION OF THE WRAPPER AND THE TOBACCO.
Claim 2
Dependent Claim
160 words
A CIGARETTE OR THE LIKE COMPRISING AS ELEMENTS A CYLINDRICAL COMBUSTIBLE WRAPPER CONTAINING TOBACCO AND A SHEATH EXTENDING CIRCUMFERENTIALLY AROUND SAID WRAPPER IN SPACED RELATION THERETO, SAID SHEATH BEING RELATIVELY NON-COMBUSTIBLE AS COMPARED WITH THE WRAPPER AND HAVING SMALL OPENINGS THEREIN TO PROVIDE FOR THE FLOW OF AIR TO THE BURNING ZONE OF THE CIGARETTE, AT LEST ONE OF SAID ELEMENTS HAVING APPLIED THERETO IN THE SPACE BETWEEN THE ELEMENTS AN INTUMESCENT SUBSTANCE, SAID INTUMESCENT SUBSTANCE COMPRISING DEPOSITS OF A SODIUM SILICATE SOLUTION HAVING A SODIUM TO SILICATE RATIO OF APPROXIMATELY 1:2 AND A BAUME READING OF APPROXIMATELY 59* AT 20*C., SAID DEPOSITS BEING DISTRIBUTED IN SPACED RELATION THROUGHOUT THE SURFACE OF THE ELEMENTS HAVING THE DEPOSITS APPLIED THERETO WHEREBY UNDER THE INFLUENCE OF THE HEAT OF BURNING OF THE WRAPPER SAID DEPOSITS WILL INTUMESCE TO SEPARATE SAID WRAPPER AND SAID SHEATH AND PROVIDE PASSAGEWAYS FOR THE SUPPLY OF COMBUSTION AIR FOR SUPPORTING COMBUSITION OF THE WRAPPER AND THE TOBACCO.
References Cited (Backward Citations)
GB340884A
Cited
US1862679A
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US1905416A
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US2098619A
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US2607353A
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US2625163A
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US2701571A
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US2827059A
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US3030963A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |