Patent US3836340A successfully refreshed from Google Patents.
US3836340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vanadium based resistor compositions
Assignee: EIDP Inc
•
Filing: 1972-01-03
•
Granted: 1974-09-17
•
Expires: 1992-01-03
Abstract
Abstract Screen printable, air fireable compositions comprising a vanadium glass, boron, and as optional components, noble metal and/or a low melting inorganic binder, wherein the vanadium glass contains 5-55 percent vanadium metal and from a small but effective amount up to 10 percent of fluorine and, sulfur. Various electronic devices are readily made from these compositions. A unique feature of the devices is their sensitivity to voltage as well as temperature. Consequently, the fired compositions are particularly useful whenever switching devices are needed, e.g., as transient suppressors in electronic equipment.
Inventors
- 👤 J Conwicke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:27
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/108; C; C03; C03C; C03C3/00; C03C3/12; C03C3/23; H01C7/04; H01C7/042; H01C7/043; H01C7/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A screen-printable air-fireable composition comprising, on a weight basis, (1) 35-99 percent of a finely divided vanadium glass, wherein said vanadium glass comprises vanadium oxide in an amount equal to 5-55 percent vanadium, calculated as vanadium metal, and from a small amount effective to minimize the temperature coefficient of resistance up to 10 percent of an ionic species selected from the group consisting of fluorine and sulfur and mixtuRes thereof; (2) 1-15 percent of boron; (3) 0-50 percent of finely divided noble metal; and (4) 0-20 percent of a finely divided sintering promotor.
Claim 2
Dependent Claim
116 words
A transient suppressor device comprising, on a weight basis, (1) 35-99 percent of a finely divided vanadium glass, wherein said vanadium glass comprises vanadium oxide in an amount equal to 5-55 percent vanadium, calculated as vanadium metal, and from a small amount effective to minimize the temperature coefficient of resistance up to 10 percent of an ionic species selected from the group consisting of fluorine and sulfur and mixtures thereof; (2) 1-15 percent of boron; (3) 0-50 percent of finely divided noble metal; and (4) 0-20 percent of a finely divided sintering promotor; the composition having been fired in air at a temperature from about 600* to 900*C. for a time within the range 1-20 minutes.
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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |