Patent US2792841A successfully refreshed from Google Patents.
US2792841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tobacco smoke filter
Assignee: Individual
•
Filing: 1953-06-09
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Granted: 1957-05-21
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Expires: 1973-06-09
Abstract
No abstract record available.
Inventors
- 👤 John D Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:08
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
A TOBACCO SMOKE FILTER COMPRISED OF THE DETOXICATING AGENTS ACETIC ACID AND FERROUS FERRITE (FE(FEO2)2) TO FORM PRECIPITATES OF CRYSTALLINE CHARACTER ON REACTION WITH DELETERIOUS PRODUCTS CONTAINED IN TOBACCO SMOKE WHICH ARE ADAPTED TO BE RETAINED IN THE FILTER.
Claim 2
Dependent Claim
39 words
A TOBACCO SMOKE FILTER COMPRISED OF THE DETOXICATING AGENTS ACETIC ACID AND FERROUS FERRITE (FE(FEO2)2) TO FORM PRECIPITATES OF CRYSTALLINE CHARACTER ON REACTION WITH DELETERIOUS PRODUCTS CONTAINED IN TOBACCO SMOKE WHICH ARE ADAPTED TO BE RETAINED IN THE FILTER.
References Cited (Backward Citations)
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US729680A
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US729218A
Cited
US2003690A
Cited
US2172946A
Cited
US2164702A
Cited
US2221443A
Cited
US2181614A
Cited
US2228383A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-20 | 1960-11-19 | 1961-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-20 | 1964-11-19 | 1965-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-20 | 1968-11-19 | 1969-05-21 | $7700.00 | Window Closed / Lapsed |