Patent US2920416A successfully refreshed from Google Patents.
US2920416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of tobacco smoke
Assignee: Wallace A Erickson and Co
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Filing: 1958-07-25
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Granted: 1960-01-12
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Expires: 1978-07-25
Abstract
No abstract record available.
Inventors
- 👤 James W Kinnavy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:05
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
A TOBACCO SMOKE FILTER COMPRISING A SUPPORTING MASS ADAPTED TO AFFORD PASSAGE OF TOBACO SMOKE THERETHROUGH, SAID MASS INCLUDING A QUATERNARY AMMONIUM COMPOUND HAVING THE GENERIC FORMULA
Claim 2
Dependent Claim
27 words
A TOBACCO SMOKE FILTER COMPRISING A SUPPORTING MASS ADAPTED TO AFFORD PASSAGE OF TOBACO SMOKE THERETHROUGH, SAID MASS INCLUDING A 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 |