US3069757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal bodies having continuously varying physical characteristics and method of making the same
Assignee: Duracell Inc USA
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Filing: 1959-06-26
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Granted: 1962-12-25
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Expires: 1979-06-26
Abstract
No abstract record available.
Inventors
- 👤 Robert K Beggs
- 👤 George G Ferling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:18
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/24; B22F3/26; H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; H01H1/0233; H01H11/00; H01H11/04; H01H11/048; B22F2998/00; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/929; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/4913; Y10T29/49204; Y10T29/49208; Y10T29/4922; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12021; Y10T428/1216; Y10T428/12465
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
THE METHOD OF MAKING ELECTRICAL CONTACTS HAVING CHARACTERISTICS WHICH VARY CONTINUOUSLY ALONG ONE FACE THEREOF, WHICH COMPRISES PROVIDING A DIE CAVITY HAVING DIFFERENT DEPTHS IN DIFFERENT TRANSVERSE REGIONS THEREOF, FILLING SAID CAVITY TO A UNIFORM HORIZONTAL LEVEL WITH REFRACTORY CONTACT METAL POWDER, DISPLACING A PUNCH INTO SAID CAVITY TO COMPACT SAID POWDER AT DIFFERENT COMPRESSION RATIOS IN SAID RESPECTIVE REGIONS WITHOUT CAUSING APPRECIABLE DISPLACEMENT OF THE POWDER IN THE TRANSVERSE DIRECTION, REMOVING THE PRESSED COMPACT FROM SAID CAVITY, SINTERING SAID COMPACT TO CONVERT IT INTO A REFRACTORY METAL SKELETON THE POROSITY OF WHICH VARIES CONTINUOUSLY IN THE TRANSVERSE DIRECTION, AND INFILTRATING SAID SKELETON WITH A LOW MELTING CONTACT METAL TO OBTAIN AN ELECTRICAL CONTACT HAVING A FACE IN WHICH EROSION RESISTANCE AND ELECTRICAL CONDUCTIVITY ARE CONTINUOUSLY AND INVERSELY VARIABLE.
Claim 2
Independent Claim
129 words
THE METHOD OF MAKING ELECTRICAL CONTACTS HAVING CHARACTERISTICS WHICH VARY CONTINUOUSLY ALONG ONE FACE THEREOF, WHICH COMPRISES PROVIDING A DIE CAVITY HAVING DIFFERENT DEPTHS IN DIFFERENT TRANSVERSE REGIONS THEREOF, FILLING SAID CAVITY TO A UNIFORM HORIZONTAL LEVEL WITH REFRACTORY CONTACT METAL POWDER, DISPLACING A PUNCH INTO SAID CAVITY TO COMPACT SAID POWDER AT DIFFERENT COMPRESSION RATIOS IN SAID RESPECTIVE REGIONS WITHOUT CAUSING APPRECIABLE DISPLACEMENT OF THE POWDER IN THE TRANSVERSE DIRECTION, REMOVING THE PRESSED COMPACT FROM SAID CAVITY, SINTERING SAID COMPACT TO CONVERT IT INTO A REFRACTORY METAL SKELETON THE POROSITY OF WHICH VARIES CONTINUOUSLY IN THE TRANSVERSE DIRECTION, AND INFILTRATING SAID SKELETON WITH A LOW MELTING CONTACT METAL TO OBTAIN AN ELECTRICAL CONTACT HAVING A FACE IN WHICH EROSION RESISTANCE AND ELECTRICAL CONDUCTIVITY ARE CONTINUOUSLY AND INVERSELY VARIABLE.
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) | 1965-12-24 | 1966-06-25 | 1966-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-24 | 1970-06-25 | 1970-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-24 | 1974-06-25 | 1974-12-25 | $7700.00 | Window Closed / Lapsed |