Patent US3232294A successfully refreshed from Google Patents.
US3232294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tobacco smoke filter
Assignee: NL Industries Inc
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Filing: 1962-03-05
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Granted: 1966-02-01
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Expires: 1982-03-05
Abstract
No abstract record available.
Inventors
- 👤 Joseph A Orsino
- 👤 Edgar H Herrmann
- 👤 Charles E Mandel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:27
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
106 words
A FILTER TIP CIGARETTE COMPRISING A HOUSING OPEN AT ITS OPPOSITE ENDS, TOBACCO IN ONE END OF SAID HOUSING AND A FILTER IN THE OPPOSITE END OF SAID HOUSING, SAID FILTER COMPRISING A MASS OF HOLLOW TUBULES OF A POLYMER, SAID TUBULES BEING RANDOMLY ORIENTED AND JOINED TOGETHER AT THEIR POINTS OF CONTACT TO FORM, INTERMEDIATE SAID POINTS OF CONTACT, TORTUOUS PATHS FOR THE PASSAGE OF SMOKE THROUGH SAID MASS AXIALLY OF SAID HOUSING, SAID HOLLOW TUBULES HAVING POROUS WALLS, THE PORES IN SAID WALLS CONNECTING THE INTERIORS OF SAID TUBULES WITH SAID TORTUOUS PATHS, SAID HOUSING ADJACENT SAID COMPACTED MASS BEING SUBSTANTIALLY IMPERVIOUS TO AIR.
References Cited (Backward Citations)
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US2916038A
Cited
US2854985A
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US3025130A
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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) | 1969-01-31 | 1969-08-02 | 1970-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-31 | 1973-08-02 | 1974-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-31 | 1977-08-02 | 1978-02-01 | $7700.00 | Window Closed / Lapsed |