Patent US2815421A successfully refreshed from Google Patents.
US2815421A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical contacts
Assignee: Metals and Controls Corp
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Filing: 1956-09-21
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Granted: 1957-12-03
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Expires: 1976-09-21
Abstract
No abstract record available.
Inventors
- 👤 Jr Childress B Gwyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:23
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A PAIR OF COOPERATING ELECTRICAL CONTACT ELEMENTS, ONE OF SAID CONTACT ELEMENTS COMPRISING AN ALLOY CONSISTING OF 60% TO 80% BY WEIGHT OF PALLADIUM 0.5% TO 1.8% BY WEIGHT OF A MODIFYING AGENT SELECTED FROM THE GROUP CONSISTING OF NICKEL COBALT AND COPPER AND MIXTURES THEREOF, AND THE REMAINDER SILVER; AND THE OTHER OF SAID CONTACT ELEMENTS COMPRISING AN ALLOY CONSISTING ESSENTIALLY OF 50% TO 80% BY WEIGHT OF GOLD AND THE REMAINDER SILVER.
Claim 2
Dependent Claim
74 words
A PAIR OF COOPERATING ELECTRICAL CONTACT ELEMENTS, ONE OF SAID CONTACT ELEMENTS COMPRISING AN ALLOY CONSISTING OF 60% TO 80% BY WEIGHT OF PALLADIUM 0.5% TO 1.8% BY WEIGHT OF A MODIFYING AGENT SELECTED FROM THE GROUP CONSISTING OF NICKEL COBALT AND COPPER AND MIXTURES THEREOF, AND THE REMAINDER SILVER; AND THE OTHER OF SAID CONTACT ELEMENTS COMPRISING AN ALLOY CONSISTING ESSENTIALLY OF 50% TO 80% BY WEIGHT OF GOLD AND THE REMAINDER SILVER.
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) | 1960-12-02 | 1961-06-03 | 1961-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-02 | 1965-06-03 | 1965-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-02 | 1969-06-03 | 1969-12-03 | $7700.00 | Window Closed / Lapsed |