US3225169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver-refractory metal electrical contact having refractory metal carbide in the marginal layer of its active contact face
Assignee: Stackpole Carbon Co
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Filing: 1964-02-24
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Granted: 1965-12-21
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Expires: 1984-02-24
Abstract
No abstract record available.
Inventors
- 👤 John C Kosco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:57
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/0047; C22C32/0052; H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; H01H1/0233
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
AN ELECTRICAL CONTACT HAVING AN ACTIVE CONTACT FACE, THE CONTACT CONSISTING ESSENTIALLY OF A SINTERED BODY OF SILVER, A FINELY DIVIDED METAL OF THE GROUP CONSISTING OF TUNGSTEN, MOLYBDENUM, TITANIUM AND SILICON, AND A CARBIDE OF SAID METAL, THE SILVER PROVIDING A MATRIX THROUGH WHICH SAID METAL IS DISTRIBUTED, AND SAID CARBIDE BEING PRESENT IN AND RESTRICTED TO THE EXPOSED MARGINAL LAYER OF SAID CONTACT FACE, THE SILVER CONSISTING OF FROM ABOUT 30 TO 65 VOLUME PERCENT OF THE CONTACT WITH THE REMAINDER OF THE CONTACT SAID METAL AND SAID CARBIDE.
Claim 2
Dependent Claim
91 words
AN ELECTRICAL CONTACT HAVING AN ACTIVE CONTACT FACE, THE CONTACT CONSISTING ESSENTIALLY OF A SINTERED BODY OF SILVER, A FINELY DIVIDED METAL OF THE GROUP CONSISTING OF TUNGSTEN, MOLYBDENUM, TITANIUM AND SILICON, AND A CARBIDE OF SAID METAL, THE SILVER PROVIDING A MATRIX THROUGH WHICH SAID METAL IS DISTRIBUTED, AND SAID CARBIDE BEING PRESENT IN AND RESTRICTED TO THE EXPOSED MARGINAL LAYER OF SAID CONTACT FACE, THE SILVER CONSISTING OF FROM ABOUT 30 TO 65 VOLUME PERCENT OF THE CONTACT WITH THE REMAINDER OF THE CONTACT SAID METAL AND SAID CARBIDE.
References Cited (Backward Citations)
US2289708A
Cited
US2298999A
Cited
US2300286A
Cited
US2624820A
Cited
US3026603A
Cited
US3139669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |