US4112193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical insulators
Assignee: NGK Insulators Ltd
•
Filing: 1976-08-03
•
Granted: 1978-09-05
•
Expires: 1996-08-03
Abstract
Abstract The invention relates to an electrical insulator coated with a semi-conducting tin oxide system glaze layer wherein the glaze layer contains 0.05 to 10 percent by weight of at least one metal oxide selected from the group consisting of niobium oxide, tantalum oxide, titanium oxide, zirconium oxide, yttrium oxide and tungsten oxide. The additional metal oxide reduces the dependance of resistance on the environmental temperature.
Inventors
- 👤 Noboru Higuchi
- 👤 Takayuki Ogasawara
- 👤 Shoji Seike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:48
CPC Classifications
H; H01; H01B; H01B19/00; H01B19/04; H01B17/00; H01B17/50
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
57 words
An electrical insulator coated on its entire surface with a semi-conducting tin oxide system glaze comprising a tin oxide-antimony oxide mixture, wherein the glaze layer contains 0.05 to 10 percent by weight of at least one metal oxide selected from the group consisting of niobium oxide, tantalum oxide, titanium oxide, zirconium oxide, yttrium oxide and tungsten oxide.
Claim 2
Dependent Claim
57 words
An electrical insulator coated on its entire surface with a semi-conducting tin oxide system glaze comprising a tin oxide-antimony oxide mixture, wherein the glaze layer contains 0.05 to 10 percent by weight of at least one metal oxide selected from the group consisting of niobium oxide, tantalum oxide, titanium oxide, zirconium oxide, yttrium oxide and tungsten oxide.
Claim 3
Dependent Claim
32 words
An electrical insulator according to claim 1, wherein the glaze layer contains at least one metal oxide selected from the group consisting of niobium oxide, tantalum oxide, zirconium oxide and yttrium oxide.
Claim 4
Dependent Claim
25 words
An electric insulator according to claim 1, wherein the at least one metal oxide is 0.1 to 8 percent by weight of the glaze layer.
References Cited (Backward Citations)
US1980182A
Cited
US2772190A
Cited
US2797175A
Cited
GB812858A
Cited
GB982600A
Cited
GB1106226A
Cited
GB1132856A
Cited
GB1112765A
Cited
GB1334164A
Cited
US3934961A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-04 | 1982-03-06 | 1982-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-04 | 1986-03-06 | 1986-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-04 | 1990-03-06 | 1990-09-05 | $7700.00 | Window Closed / Lapsed |