US4967306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High purity aromatic polyesters
Assignee: 3M Co
•
Filing: 1989-05-05
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Granted: 1990-10-30
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Expires: 2009-05-05
Abstract
Abstract This invention provides oligomer-free polyesters that consist essentially of repeating, interpolymerized units derived from isophthalic acid and/or terephthalic acid, and 9,9-bis-(4-hydroxyphenyl)-fluorene, a process for making such polyesters and articles comprising said polyesters such as electrical capacitors, optical films and fibers.
Inventors
- 👤 Edward F. Hampl, Jr.
- 👤 Mohammad Iqbal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:02
CPC Classifications
C; C08; C08G; C08G63/00; C08J; C08J5/00; C08J5/18; B; B41; B41M; B41M5/00; B41M5/26; B41M5/40; B41M5/41; B41M5/42; B41M5/44; B41M5/50; B41M5/52; B41M5/5263; B41M5/5272; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19; C08G63/193; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; H01B3/421; H01B3/422; H01B3/423; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/14; H01G4/18; C08J2367/00; C08J2367/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
31 words
A film-wound capacitor including layers of film that comprises oligomer-free polyester consisting essentially of repeating interpolymerized units derived from isophthalic acid and/or terephthalic acid and 9,9-bis-(4-hydroxyphenyl)-fluorene interleaved with metallic conductor layers.
Claim 2
Dependent Claim
31 words
A film-wound capacitor including layers of film that comprises oligomer-free polyester consisting essentially of repeating interpolymerized units derived from isophthalic acid and/or terephthalic acid and 9,9-bis-(4-hydroxyphenyl)-fluorene interleaved with metallic conductor layers.
Claim 3
Dependent Claim
16 words
The capacitor of claim 1 wherein the 9,9-bis-(4-hydroxyphenyl)-fluorene has a polydispersivity of about 2 to 3.
Claim 4
Dependent Claim
17 words
The capacitor of claim 1 wherein the 9,9-bis-(4-hydroxyphenyl)-fluorene has a weight-average molecular weight of at least 700,000.
Claim 5
Dependent Claim
17 words
The capacitor of claim 1 wherein the 9,9-bis-(4-hydroxyphenyl)-fluorene has a weight-average molecular weight of at least 900,000.
Claim 6
Dependent Claim
16 words
The capacitor of claim 1 wherein the 9,9-bis-(4-hydroxyphenyl)-fluorene contains one percent or less of oligomeric species.
Claim 7
Dependent Claim
14 words
The capacitor of claim 1 wherein the film is at least 5 microns thick.
Claim 8
Dependent Claim
14 words
The capacitor of claim 1 wherein film is solution-coated onto the metallic conductor layer.
Claim 9
Dependent Claim
32 words
The capacitor claim 1 wherein the 9,9-bis-(4-hydroxyphenyl)-fluorene has a polydispersivity of about 2 to 3, a weight-average molecular weight of at least 700,000 and contains one percent or less of oligomeric species.
Claim 10
Dependent Claim
16 words
The capacitor of claim 1 in which the metallic conductor layer is vapor-deposited onto the film.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-29 | 1994-04-30 | 1994-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-29 | 1998-04-30 | 1998-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-29 | 2002-04-30 | 2002-10-30 | $7700.00 | Window Closed / Lapsed |