Patent US3353931A successfully refreshed from Google Patents.
US3353931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tungsten-indium powder bodies infiltrated with copper
Assignee: Duracell Inc USA
•
Filing: 1966-05-26
•
Granted: 1967-11-21
•
Expires: 1986-05-26
Abstract
No abstract record available.
Inventors
- 👤 Edward J Zdanuk
- 👤 Richard H Krock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:45
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/0203; C; C22; C22C; C22C21/00; C22C21/02; C22C27/00; C22C27/04; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/925; Y10S428/9265; Y10S428/929; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/1216; Y10T428/12174
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A COMPOSITE MATERIAL HAVING A LOW VOLUME OF GAS CONTENT FOR USE AS AN ELECTRICAL CONTACT MATERIAL IN VACUUM SWITCHING DEVICES CONSISTING OF TUNGSTEN PARTICLES SURROUNDED BY AND INTEGRALLY JOINED WITH A MATRIX OF A COPPER-INDIUM ALLOY, SAID MATRIX HAVING A HIGH CONCENTRATION OF SAID INDIUM IN THE INTERFACE REGION BETWEEN SAID TUNGSTEN PARTICLES AND SAID COPPER-INDIUM ALLOY MATRIX THEREBY RAISING THE OVERALL ELECTRICAL CONDUCTIVITY OF SAID COPPER-INDIUM ALLOY MATRIX.
Claim 2
Dependent Claim
70 words
A COMPOSITE MATERIAL HAVING A LOW VOLUME OF GAS CONTENT FOR USE AS AN ELECTRICAL CONTACT MATERIAL IN VACUUM SWITCHING DEVICES CONSISTING OF TUNGSTEN PARTICLES SURROUNDED BY AND INTEGRALLY JOINED WITH A MATRIX OF A COPPER-INDIUM ALLOY, SAID MATRIX HAVING A HIGH CONCENTRATION OF SAID INDIUM IN THE INTERFACE REGION BETWEEN SAID TUNGSTEN PARTICLES AND SAID COPPER-INDIUM ALLOY MATRIX THEREBY RAISING THE OVERALL ELECTRICAL CONDUCTIVITY OF SAID COPPER-INDIUM ALLOY MATRIX.
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) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |