Patent US3935157A successfully refreshed from Google Patents.
US3935157A
Expired / Lapsed
US
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Polycarbonate resin having improved electrical tracking resistance
Assignee: Bayer AG
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Filing: 1974-03-28
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Granted: 1976-01-27
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Expires: 1994-03-28
Abstract
Abstract A polycarbonate plastic having improved electrical tracking resistance is provided by including in the polycarbonate a substance which is normally an oxidation or combustion catalyst such as a transition metal having a positive oxidation potential of >+0.2 volt.
Inventors
- 👤 Paul Schiller
- 👤 Hugo Vernaleken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:54
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; H01B3/421; H01B3/426; C; C08; C08K; C08K3/00; C08K3/02; C08K3/08; C08K3/18; C08K3/20; C08K3/22; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
58 words
An electrical insulator having a minimum tracking resistance to leakage current of about 280 volts comprising an intimate blend of a high molecular weight thermoplastic polycarbonate based on an aromatic bis-hydroxy compound and 0.05% to 10% by weight of additives selected from the group consisting of oxides of vanadium, molybdenum, cerium, palladium, copper, silver, cobalt, nickel, and platinum.
Claim 2
Dependent Claim
58 words
An electrical insulator having a minimum tracking resistance to leakage current of about 280 volts comprising an intimate blend of a high molecular weight thermoplastic polycarbonate based on an aromatic bis-hydroxy compound and 0.05% to 10% by weight of additives selected from the group consisting of oxides of vanadium, molybdenum, cerium, palladium, copper, silver, cobalt, nickel, and platinum.
Claim 3
Dependent Claim
58 words
An electrical insulator having a minimum tracking resistance to leakage current of about 300 volts comprising an intimate blend of a high molecular weight polycarbonate thermoplastic polycarbonate based on an aromatic bis-hydroxy compound and 0.05% to 10% by weight of additives selected from the group consisting of oxides of vanadium, molybdenum, palladium, copper, silver, cobalt, nickel, and platinum.
Claim 4
Dependent Claim
58 words
An electrical insulator having a minimum tracking resistance to leakage current of about 300 volts comprising an intimate blend of a high molecular weight polycarbonate thermoplastic polycarbonate based on an aromatic bis-hydroxy compound and 0.05% to 10% by weight of additives selected from the group consisting of oxides of vanadium, molybdenum, palladium, copper, silver, cobalt, nickel, and platinum.
Claim 5
Dependent Claim
23 words
The insulator of claim 2 wherein the polycarbonate contains 0.1 to 3 percent by weight of additive based on the weight of polycarbonate.
Claim 6
Dependent Claim
20 words
The insulator of claim 2 wherein the additive is deposited on a carrier material which is blended with the polycarbonate.
Claim 7
Dependent Claim
18 words
The insulator of claim 2 wherein the polycarbonate has a molecular weight of between about 20,000 and 40,000.
References Cited (Backward Citations)
US3148172A
Cited
US3418066A
Cited
US3492268A
Cited
US3577346A
Cited
US3817907A
Cited
US3817911A
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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) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |