Patent US4652282A successfully refreshed from Google Patents.
US4652282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electretized material for a dust filter
Assignee: Toyobo Co Ltd
•
Filing: 1985-03-18
•
Granted: 1987-03-24
•
Expires: 2005-03-18
Abstract
Abstract An electretized material for a dust filter which is made of an insulating polymer material such as polypropylene incorporated with a fatty acid metal salt in an amount of not less than 100 ppm in terms of the metal.
Inventors
- 👤 Susumu Ohmori
- 👤 Akira Yagi
- 👤 Satoshi Takase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:07
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/28; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; H; H01; H01G; H01G7/00; H01G7/02; H01G7/021; H01G7/023; B01D2239/00; B01D2239/10; Y; Y10; Y10S; Y10S55/00; Y10S55/39
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
51 words
An electretized material for a filter to be used for elimination of dust from a dust-containing gas comprising a uniform mixture of an insulating polymer and a fatty acid metal salt, wherein the amount of the fatty acid metal salt is not less than 100 ppm in terms of the metal.
Claim 2
Dependent Claim
51 words
An electretized material for a filter to be used for elimination of dust from a dust-containing gas comprising a uniform mixture of an insulating polymer and a fatty acid metal salt, wherein the amount of the fatty acid metal salt is not less than 100 ppm in terms of the metal.
Claim 3
Dependent Claim
27 words
A dust filter according to claim 1, wherein the amount of the fatty acid metal salt is from 200 to 2,000 ppm in terms of the metal.
References Cited (Backward Citations)
US4000102A
Cited
US4187157A
Cited
US4215682A
Cited
US4254028A
Cited
US4323374A
Cited
US4375718A
Cited
US4486365A
Cited
US4501840A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-23 | 1990-09-22 | 1991-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-23 | 1994-09-22 | 1995-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-23 | 1998-09-22 | 1999-03-24 | $7700.00 | Window Closed / Lapsed |