US4374049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zinc oxide varistor composition not containing silica
Assignee: Hubbell Inc
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Filing: 1980-06-06
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Granted: 1983-02-15
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Expires: 2000-06-06
Abstract
Abstract Zinc oxide varistors having high resistance and exponent values are fabricated from a composition consisting essentially of the oxides of zinc, tin, bismuth, antimony, manganese, nickel, cobalt and boron. The composition does not contain barium oxide or silicon dioxide and still retains long term stability properties.
Inventors
- 👤 Howard F. Ellis
- 👤 Herbert Fishman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:07
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/108; H01C7/112
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
82 words
A zinc oxide varistor composition free of the oxides of silicon and barium, comprising: ZnO as a major constituent; equimolar concentrations of about 0.5 mole percent of each of the oxides of Bi, Co, Mn, and Sn; and about 2.0 mole percent of the oxide of Sb, about 1.0 mole percent of the oxide of Ni, and about 0.01 to about 0.10 mole percent of the oxide of B wherein the quantity of Ni is less than Sb and greater than B.
Claim 2
Dependent Claim
82 words
A zinc oxide varistor composition free of the oxides of silicon and barium, comprising: ZnO as a major constituent; equimolar concentrations of about 0.5 mole percent of each of the oxides of Bi, Co, Mn, and Sn; and about 2.0 mole percent of the oxide of Sb, about 1.0 mole percent of the oxide of Ni, and about 0.01 to about 0.10 mole percent of the oxide of B wherein the quantity of Ni is less than Sb and greater than B.
Claim 3
Dependent Claim
12 words
The composition of claim 1 wherein zinc oxide is 95 mole percent.
Claim 4
Dependent Claim
15 words
The composition of claim 1 wherein the oxide of B is about 0.05 mole percent.
Claim 5
Dependent Claim
62 words
A zinc oxide varistor composition free of the oxides of silicon and barium, comprising: 0.50 mole percent of the oxides of Bi, Co, Mn and Sn; 2.00 mole percent of the oxide of Sb; 1.00 mole percent of the oxide of Ni; and about 0.01 to about 0.10 mole percent of the oxide of B, the remainder consisting essentially of zinc oxide.
Claim 6
Dependent Claim
62 words
A zinc oxide varistor composition free of the oxides of silicon and barium, comprising: 0.50 mole percent of the oxides of Bi, Co, Mn and Sn; 2.00 mole percent of the oxide of Sb; 1.00 mole percent of the oxide of Ni; and about 0.01 to about 0.10 mole percent of the oxide of B, the remainder consisting essentially of zinc oxide.
References Cited (Backward Citations)
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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) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |