Patent US2801638A successfully refreshed from Google Patents.
US2801638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter tip for tobacco products
Assignee: Brown and Williamson Holdings Inc
•
Filing: 1954-05-11
•
Granted: 1957-08-06
•
Expires: 1974-05-11
Abstract
No abstract record available.
Inventors
- 👤 Milton O Schur
- 👤 Overton L Hillsman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:51
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/16; A24D3/163
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A FILTER FOR SMOKING DEVICES COMPRISING A WRAPPER, AND A FILLING A PAPER WEIGHT NOT MORE THAN 30 GRAMS PER SQUARE METER ARRANGED IN THE WRAPPER IN A MULTITUDE OF LAYERS TO FORM A MAZE OF TORTUOUS PASSAGEWAYS EXTEND ING GENERALLY LONGITUDINALLY THROUGH THE FILTER, SAID PAPER HAVING PARTICLES OF ACTIVATED CHARCOAL PREDOMINANTLY OF 100-300 MESH DISPERSED THERIN AND SSCURED TO INDIVIDUAL FIBERS OF THE PAPER, THE PARTICLES HAVING ACTIVE SURFACES EXPOSED TO SAID PASSAGEWAYS AGAINST WHICH THE TOBACO SMOKE WILL IMPINGE AS IT FLOWS THROUGH THE PASSAGES.
Claim 2
Dependent Claim
88 words
A FILTER FOR SMOKING DEVICES COMPRISING A WRAPPER, AND A FILLING A PAPER WEIGHT NOT MORE THAN 30 GRAMS PER SQUARE METER ARRANGED IN THE WRAPPER IN A MULTITUDE OF LAYERS TO FORM A MAZE OF TORTUOUS PASSAGEWAYS EXTEND ING GENERALLY LONGITUDINALLY THROUGH THE FILTER, SAID PAPER HAVING PARTICLES OF ACTIVATED CHARCOAL PREDOMINANTLY OF 100-300 MESH DISPERSED THERIN AND SSCURED TO INDIVIDUAL FIBERS OF THE PAPER, THE PARTICLES HAVING ACTIVE SURFACES EXPOSED TO SAID PASSAGEWAYS AGAINST WHICH THE TOBACO SMOKE WILL IMPINGE AS IT FLOWS THROUGH THE PASSAGES.
References Cited (Backward Citations)
DE612737C
Cited
CH188399A
Cited
US2033867A
Cited
US2164702A
Cited
US2181614A
Cited
GB538529A
Cited
US2325386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |