US4288584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electret made of branched alpha-olefin polymer
Assignee: Lanxess Canada Co
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Filing: 1978-10-30
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Granted: 1981-09-08
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Expires: 1998-10-30
Abstract
Abstract A stable electret made of a resinous polymer of a branched alpha-olefin [e.g., poly(4-methyl-1-pentene)] having a degree of crystallinity of at least 20%.
Inventors
- 👤 Anupama Mishra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:03
CPC Classifications
H; H01; H01G; H01G7/00; H01G7/02; H01G7/021; H01G7/023; C; C08; C08F; C08F110/00; C08F110/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
53 words
A homoelectret comprising an electrostatically polarized resinous polymer of an alpha-olefin having a branched side chain, said polymer being composed of repeating units having the structure ##STR2## wherein R is a branched alkyl radical having from 3 to 10 carbon atoms, the said polymer having a crystallinity of at least 20% by weight.
Claim 2
Dependent Claim
53 words
A homoelectret comprising an electrostatically polarized resinous polymer of an alpha-olefin having a branched side chain, said polymer being composed of repeating units having the structure ##STR2## wherein R is a branched alkyl radical having from 3 to 10 carbon atoms, the said polymer having a crystallinity of at least 20% by weight.
Claim 3
Dependent Claim
16 words
A homoelectret as in claim 1 which is in the form of a film or sheet.
Claim 4
Dependent Claim
15 words
An electrostatic device in which the electrostatic element is a homoelectret as in claim 1.
Claim 5
Dependent Claim
13 words
A homoelectret as in claim 1 in which the said polymer is poly(4-methyl-1-pentene).
Claim 6
Dependent Claim
13 words
A homoelectret as in claim 1 in which the said polymer is poly(3-methyl-1-butene).
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) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |