Patent US4212914A successfully refreshed from Google Patents.
US4212914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroinsulating material
Assignee: Individual
•
Filing: 1978-05-23
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Granted: 1980-07-15
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Expires: 1998-05-23
Abstract
Abstract The electroinsulating material of the present invention contains a fluorine rubber, low-molecular weight sticky resin, cross-linking agents, particles of a mica-containing material, and a mineral filler. This material features high corona resistance, elasticity, heat resistance, and incombustibility.
Inventors
- 👤 Leonty T. Ponomareva
- 👤 Nina V. Ponomareva
- 👤 Sergei V. Vasiliev
- 👤 Olga V. Maximikhina
- 👤 Nina M. Golopolosova
- 👤 Ljudmila I. Belkina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:42
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/28; H01B3/02; H01B3/04; H01F; H01F27/00; H01F27/28; H01F27/32; H01F27/323; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/251; Y10T428/31504; Y10T428/31511; Y10T428/3154; Y10T428/31551; Y10T428/31565; Y10T428/31786; Y10T428/31797; Y10T428/31942; Y10T428/31949; Y10T428/31957; Y10T442/00; Y10T442/20; Y10T442/2475
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
119 words
An electroinsulating material consisting essentially of, in percent by weight, ______________________________________
fluorine rubber 20-87
resin 1-10
synthetic rubber 0-30
cross-linking agent
0.1-10
mica 10-60
filler at least 0.9 and re-
presenting the balance
______________________________________ wherein said fluorine rubber is a copolymer of vinylidene fluoride; said resin is a low molecular weight sticky resin selected from the group consisting of epoxy resins based on diphenylolpropane, urea-formaldehyde resins, phenol-formaldehyde resins, aminophenol resins, melamine-formaldehyde resins, urethane resins, xylenol resins, coumarone resins and indene-coumarone resins; said cross-linking agent is a cross-linking agent for said fluorine rubber; the mica consists of particles having a thickness of 1-10 microns; and said filler is a mineral filler which acts as a distribution agent for said mica.
Claim 2
Dependent Claim
119 words
An electroinsulating material consisting essentially of, in percent by weight, ______________________________________
fluorine rubber 20-87
resin 1-10
synthetic rubber 0-30
cross-linking agent
0.1-10
mica 10-60
filler at least 0.9 and re-
presenting the balance
______________________________________ wherein said fluorine rubber is a copolymer of vinylidene fluoride; said resin is a low molecular weight sticky resin selected from the group consisting of epoxy resins based on diphenylolpropane, urea-formaldehyde resins, phenol-formaldehyde resins, aminophenol resins, melamine-formaldehyde resins, urethane resins, xylenol resins, coumarone resins and indene-coumarone resins; said cross-linking agent is a cross-linking agent for said fluorine rubber; the mica consists of particles having a thickness of 1-10 microns; and said filler is a mineral filler which acts as a distribution agent for said mica.
Claim 3
Dependent Claim
15 words
An electroinsulating material as claimed in claim 1 wherein said mica is muscovite or phlogopite.
Claim 4
Dependent Claim
25 words
A composite formed by dissolving the electroinsulating material of claim 1 in a solvent and applying said material onto a base as a calibrated layer.
Claim 5
Dependent Claim
43 words
An electroinsulating material as claimed in claim 1 wherein said sticky resin is an epoxy resin based on diphenylolpropane with a molecular weight not exceeding 1000 and is present in an amount of 10% by weight, and said cross-linking agent is dicumyl peroxide.
Claim 6
Dependent Claim
17 words
An electroinsulating material as claimed in claim 3 wherein said base is a film of polyethylene terephthalate.
Claim 7
Dependent Claim
20 words
An electroinsulating material as claimed in claim 5 wherein said fluorine rubber is a copolymer of vinylidene fluoride and trifluorochlorethylene.
Claim 8
Dependent Claim
18 words
An electroinsulating material as claimed in claim 6 wherein said resin is an epoxy resin based on diphenylolpropane.
Claim 9
Dependent Claim
35 words
An electroinsulating material as claimed in claim 7 wherein said resin has a molecular weight not exceeding 1000 and is present in an amount of 10% by weight and said cross-linking agent is dicymyl peroxide.
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) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |