US2832351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating tobacco smoke
Assignee: Verdurin Co
•
Filing: 1950-06-26
•
Granted: 1958-04-29
•
Expires: 1970-06-26
Abstract
No abstract record available.
Inventors
- 👤 William J Hale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:18
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/061
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
AS AN ARTICLE OF MANUFACTURE, A CIGARETTE HAVING A POROUS SMOKE FILTER ASSOCIATED WITH ONE END THEREOF, IN WHICH FILTER IS INCORPORATED A QUALITY OF AN OXIDATIVE PORPHYRIN IN A ZONE OF SAID FILTER SPACED FROM THE TWO ENDS THEREOF.
Claim 2
Dependent Claim
40 words
AS AN ARTICLE OF MANUFACTURE, A CIGARETTE HAVING A POROUS SMOKE FILTER ASSOCIATED WITH ONE END THEREOF, IN WHICH FILTER IS INCORPORATED A QUALITY OF AN OXIDATIVE PORPHYRIN IN A ZONE OF SAID FILTER SPACED FROM THE TWO ENDS THEREOF.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-28 | 1961-10-28 | 1962-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-28 | 1965-10-28 | 1966-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-28 | 1969-10-28 | 1970-04-29 | $7700.00 | Window Closed / Lapsed |