US3340879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cigarette filters
Assignee: Brown and Williamson Holdings Inc
•
Filing: 1967-01-16
•
Granted: 1967-09-12
•
Expires: 1987-01-16
Abstract
No abstract record available.
Inventors
- 👤 Horsewell Henry George
- 👤 Rayner Graham Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:52
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06; A24D3/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
A TOBACCO SMOKE FILTER COMPRISING FIBROUS TOBACCO SMOKE FILTER MATERIAL TREATED WITH A POLY(ALKYLENEIMINE) OF THE AVERAGE FORMULA:
Claim 2
Dependent Claim
18 words
A TOBACCO SMOKE FILTER COMPRISING FIBROUS TOBACCO SMOKE FILTER MATERIAL TREATED WITH A POLY(ALKYLENEIMINE) OF THE AVERAGE FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-11 | 1971-03-13 | 1971-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-11 | 1975-03-13 | 1975-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-11 | 1979-03-13 | 1979-09-12 | $7700.00 | Window Closed / Lapsed |