US4789504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electretized material for a dust filter
Assignee: Toyobo Co Ltd
•
Filing: 1986-10-01
•
Granted: 1988-12-06
•
Expires: 2006-10-01
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 08:46
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: 18
Claim 1
Independent Claim
35 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 of aluminum or magnesium.
Claim 2
Dependent Claim
35 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 of aluminum or magnesium.
Claim 3
Dependent Claim
17 words
An electretized material for a filter according to claim 1, wherein the insulating polymer material is polypropylene.
Claim 4
Independent Claim
70 words
A method for the manufacture of an electretized material for a filter to be used for elimination of dust from a dust-containing gas which comprises the steps of forming a uniform mixture of an insulating polymer material and a fatty acid metal salt of aluminum or magnesium, and subjecting the mixture to drawing, followed by subjecting the resultant drawn material to friction, thereby imparting permanent dielectric polarization to the material.
Claim 5
Independent Claim
70 words
A method for the manufacture of an electretized material for a filter to be used for elimination of dust from a dust-containing gas which comprises the steps of forming a uniform mixture of an insulating polymer material and a fatty acid metal salt of aluminum or magnesium, and subjecting the mixture to drawing, followed by subjecting the resultant drawn material to friction, thereby imparting permanent dielectric polarization to the material.
Claim 6
Dependent Claim
13 words
A method according to claim 3, wherein the insulating polymer material is polypropylene.
Claim 7
Dependent Claim
26 words
A method according to claim 3, wherein the amount of the fatty acid metal salt is not less than 100 ppm in terms of the metal.
Claim 8
Dependent Claim
25 words
A method according to claim 5, wherein the amount of the fatty acid metal salt is from 200 to 2,000 in terms of the metal.
Claim 9
Independent Claim
73 words
A method for the manufacture of an electretized material for a filter to be used for elimination a dust from a dust-containing gas which comprises the steps of forming a uniform mixture of an insulating polymer material and a fatty acid metal salt of aluminum or magnesium, and subjecting the mixture to drawing, followed by subjecting the resultant drawn material to a corona charge treatment, thereby imparting permanent dielectric polarization to the material.
Claim 10
Independent Claim
73 words
A method for the manufacture of an electretized material for a filter to be used for elimination a dust from a dust-containing gas which comprises the steps of forming a uniform mixture of an insulating polymer material and a fatty acid metal salt of aluminum or magnesium, and subjecting the mixture to drawing, followed by subjecting the resultant drawn material to a corona charge treatment, thereby imparting permanent dielectric polarization to the material.
Claim 11
Dependent Claim
13 words
A method according to claim 7, wherein the insulating polymer material is polypropylene.
Claim 12
Dependent Claim
26 words
A method according to claim 7, wherein the amount of the fatty acid metal salt is not less than 100 ppm in terms of the metal.
Claim 13
Dependent Claim
21 words
A method according to claim 9, wherein the amount of the fatty acid metal salt is from 200 to 2,000 ppm.
Claim 14
Independent Claim
74 words
A method for the manufacture of an electretized material for a filter to be used for elimination of dust from a dust-containing gas which comprises the steps of forming a uniform mixture of an insulating polymer material and a fatty acid metal salt of aluminum or magnesium, and subjecting the mixture to drawing, followed by subjecting the resultant drawn material to friction while corona charge treating, thereby imparting permanent dielectric polarization to the material.
Claim 15
Independent Claim
74 words
A method for the manufacture of an electretized material for a filter to be used for elimination of dust from a dust-containing gas which comprises the steps of forming a uniform mixture of an insulating polymer material and a fatty acid metal salt of aluminum or magnesium, and subjecting the mixture to drawing, followed by subjecting the resultant drawn material to friction while corona charge treating, thereby imparting permanent dielectric polarization to the material.
Claim 16
Dependent Claim
13 words
A method according to claim 11, wherein the insulating polymer material is polypropylene.
Claim 17
Dependent Claim
26 words
A method according to claim 11, wherein the amount of the fatty acid metal salt is not less than 100 ppm is terms of the metal.
Claim 18
Dependent Claim
26 words
A method according to claim 13, 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
US3998916A
Cited
US4178157A
Cited
US4215682A
Cited
US4308223A
Cited
US4375718A
Cited
US4486365A
Cited
US4652282A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-06 | 1992-06-06 | 1992-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-06 | 1996-06-06 | 1996-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-06 | 2000-06-06 | 2000-12-06 | $7700.00 | Window Closed / Lapsed |