Patent US4407198A successfully refreshed from Google Patents.
US3590197A
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Electrical contacts containing gettering material
Assignee: Allis Chalmers Corp
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Filing: 1968-10-31
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Granted: 1971-06-29
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Expires: 1988-10-31
Abstract
Abstract An electrical contact for a vacuum interrupter consists of a binary alloy of 95 to 99 percent tungsten and 1 to 5 percent tantalum, which alloy when heated during contact arcing getters undesirable hydrogen which may be present in the interrupter.
Inventors
- 👤 Henry J Wesoloski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:42
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/60; H01H33/66; H01H33/668; H01H33/6683; H01J; H01J7/00; H01J7/14; H01J7/18
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
11 words
An electrical contact consisting of a composition of tungsten and tantalum.
Claim 2
Dependent Claim
11 words
An electrical contact consisting of a composition of tungsten and tantalum.
Claim 3
Dependent Claim
21 words
A contact according to claim 1 consisting of about 95 to 99 percent tungsten and about 1 to 5 percent tantalum.
References Cited (Backward Citations)
CA693827A
Cited
US2321910A
Cited
US2785285A
Cited
FR1201164A
Cited
US3270172A
Cited
US3198932A
Cited
US3379846A
Cited
SU211693A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |