US3571491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical insulating compositions of polyester resin, epoxy resin, polyvinyl acetal resin and finely divided filler
Assignee: General Electric Co
•
Filing: 1968-08-22
•
Granted: 1971-03-16
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Expires: 1988-08-22
Abstract
Abstract Acid-rich polyester epoxy resin compositions containing polyvinyl acetal and finely divided filler are characterized by improved mechanical and electrical qualities and are useful as coating and impregnating compositions for tapes.
Inventors
- 👤 Henry J Markowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:39
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/48; H01B3/50; H01B3/30; H01B3/42; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31525
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
51 words
A composition as in claim 1 in which the ingredients are present in parts by weight in the amount of 30 to 90 parts polyester, 10 to 70 parts epoxy resin, 50 to 250 parts polyvinyl acetal as a 10 percent solvent solution, and 0.1 to 10 parts finely divided filler.
Claim 2
Dependent Claim
51 words
A composition as in claim 1 in which the ingredients are present in parts by weight in the amount of 45 to 65 parts polyester, 35 to 55 parts epoxy resin, 100 to 200 parts polyvinyl acetal as a 10 percent solvent solution, and 0.5 to 3 parts finely divided filler.
Claim 3
Dependent Claim
10 words
A tape coated and impregnated with the composition of claim
Claim 4
Dependent Claim
16 words
An electrical conductor wound with a tape coated and impregnated with the composition of claim 1.
Claim 5
Dependent Claim
13 words
A composition as in claim 1 where said triol is tris (2-hydroxyethyl) isocyanurate.
Claim 6
Dependent Claim
26 words
A composition as in claim 1 comprising 50 to 90 parts of acid-rich polyester, 10 to 50 parts of liquid epoxy resin having 1,2 epoxy groups.
References Cited (Backward Citations)
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US2691007A
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US2707204A
Cited
US2909495A
Cited
US3027279A
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US3239598A
Cited
US3342780A
Cited
US3340212A
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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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |