US3670740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cigarette filter materials
Assignee: Nippon Cloth Ind Co Ltd
•
Filing: 1970-01-13
•
Granted: 1972-06-20
•
Expires: 1990-01-13
Abstract
Abstract A cigarette having a filter prepared by kneading a mixture of gluten and wheat flour with water, baking the kneaded mixture, and crushing the backed product into coarse grains of less than 60 mesh.
Inventors
- 👤 Sadao Takenaka
- 👤 Soichiro Kishida
- 👤 Yoichi Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:22
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
17 words
The material of claim 1 wherein said material has a shape conforming to that of a cigarette.
Claim 2
Dependent Claim
22 words
A cigarette filter material as in claim 1 in which the baked mixture is crushed in the form of a coarse powder.
Claim 3
Dependent Claim
24 words
The cigarette filter material of claim 3 wherein the crushed baked mixture comprises coarse powder having a size of substantially smaller than 60 mesh.
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |