Patent US3797504A successfully refreshed from Google Patents.
US3797504A
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US
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Smoking articles
Assignee: Brown and Williamson Holdings Inc
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Filing: 1972-01-03
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Granted: 1974-03-19
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Expires: 1992-01-03
Abstract
Abstract A smoking article is disclosed wherein a constant supplementary air supply is afforded to the rear of the burning coal and through the combustible wrapper. The wrapper is modified to effect this by being treated with sodium or potassium chlorate in two longitudinally extending areas 40mm long and 5mm wide disposed rearwardly of the end to be lit. The concentration of the chlorate salt in the treated areas is from 0.1 to 0.7 mg per square centimeter. During smoking, the treated areas in the vicinity of the burning coal open to provide external air ingress apertures for the stated purpose.
Inventors
- 👤 I Hughes
- 👤 S Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:25
CPC Classifications
A; A24; A24D; A24D1/00; A24D1/02; A24D1/025
Claims Analysis
Total Claims: 0
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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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |