Patent US3327718A successfully refreshed from Google Patents.
US3327718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tobacco-smoke filters
Assignee: Brown and Williamson Holdings Inc
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Filing: 1964-10-09
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Granted: 1967-06-27
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Expires: 1984-10-09
Abstract
No abstract record available.
Inventors
- 👤 Kilburn Keith Douglas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:07
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/16; A24D3/166
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A TOBACCO-SMOKE FILTER COMPRISING AN ARTIFICIAL ZEOLITE MATERIAL CAPABLE OF ACTING AS A MOLECULAR SIEVE AND HAVING A MINIMUM PORE SIZE OF 4 ANGSTROM UNITS, WHICH IS COMPLETELY DEACTIVATED BY WATER VAPOUR THEREBY PROVIDING LARGE REACTIVE SURFACES HAVING INCREASED ABSORPTION AFFINITY FOR NITROGEN DIOXIDE.
Claim 2
Dependent Claim
44 words
A TOBACCO-SMOKE FILTER COMPRISING AN ARTIFICIAL ZEOLITE MATERIAL CAPABLE OF ACTING AS A MOLECULAR SIEVE AND HAVING A MINIMUM PORE SIZE OF 4 ANGSTROM UNITS, WHICH IS COMPLETELY DEACTIVATED BY WATER VAPOUR THEREBY PROVIDING LARGE REACTIVE SURFACES HAVING INCREASED ABSORPTION AFFINITY FOR NITROGEN DIOXIDE.
References Cited (Backward Citations)
GB932570A
Cited
US3251365A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-26 | 1970-12-26 | 1971-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-26 | 1974-12-26 | 1975-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-26 | 1978-12-26 | 1979-06-27 | $7700.00 | Window Closed / Lapsed |