Patent US3051273A successfully refreshed from Google Patents.
Patent US2920630A successfully refreshed from Google Patents.
US2920630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tobacco smoke filter
Assignee: Wallace A Erickson and Co
•
Filing: 1958-07-23
•
Granted: 1960-01-12
•
Expires: 1978-07-23
Abstract
No abstract record available.
Inventors
- 👤 James W Kinnavy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:21
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
64 words
A TOBACCO SMOKING ARTICLE HAVING DISPOSED THEREIN TOBACCO AND A TOBACCO SMOKE FILTER ADAPTED TO PERMIT THE PASSAGE OF THE SMOKE THERETHROUGH, SAID FILTER COMPRISING A SUPPORTING MASS WHICH INCLUDES A QUATERNARY AMMONIUM COMPOUND, WHEREBY IRRITATING CONSTITUENTS IN TOBACCO SMOKE ARE RETAINED BY SAID FILTER WHEN SMOKE FROM THE BURNING TOBACCO IS DRAWN THROUGH SAID FILTER, SAID QUATERNARY AMMONIUM COMPOUND HAVING THE GENERIC FORMULA
References Cited (Backward Citations)
US2580609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |