US2973283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatment
Assignee: Engelhard Industries Inc
•
Filing: 1957-10-25
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Granted: 1961-02-28
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Expires: 1977-10-25
Abstract
No abstract record available.
Inventors
- 👤 James S Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:50
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/01; B32B15/018; C; C03; C03B; C03B37/00; C03B37/08; C03B37/0805; C03B37/095; C23; C23C; C23C28/00; C23C28/02; C23C28/023; C25; C25D; C25D5/00; C25D5/10; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/934; Y10S428/941; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12875; Y10T428/12889
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A SURFACE TREATMENT FOR ARTICLES MADE FROM PLATINUM-RHODIUM ALLOYS WHICH COMPRISES COATING THE SURFACE WITH PLATINUM, SUBSEQUENTLY APPLYING A COATING OF GOLD UPON THE PLATINUM LAYER, EACH OF THE COATINGS BEING SUFFICIENTLY THICK TO ALLOW THE FORMATION OF BOUNDARY ZONES OF SOLID SOLUTIONS, AND HEATING TO DIFFUSION TEMPERATURE TO HARDEN THE OUTER SURFACE OF THE ARTICLE TO A HARDNESS AT LEAST EQUAL TO THAT OF THE PLATINUM-RHODIUM ALLOY BY THE FORMATION OF SAID SOLID SOLUTIONS.
Claim 2
Dependent Claim
75 words
A SURFACE TREATMENT FOR ARTICLES MADE FROM PLATINUM-RHODIUM ALLOYS WHICH COMPRISES COATING THE SURFACE WITH PLATINUM, SUBSEQUENTLY APPLYING A COATING OF GOLD UPON THE PLATINUM LAYER, EACH OF THE COATINGS BEING SUFFICIENTLY THICK TO ALLOW THE FORMATION OF BOUNDARY ZONES OF SOLID SOLUTIONS, AND HEATING TO DIFFUSION TEMPERATURE TO HARDEN THE OUTER SURFACE OF THE ARTICLE TO A HARDNESS AT LEAST EQUAL TO THAT OF THE PLATINUM-RHODIUM ALLOY BY THE FORMATION OF SAID SOLID SOLUTIONS.
References Cited (Backward Citations)
US1704126A
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US2106527A
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US2460547A
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US2646616A
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US2803925A
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US2796361A
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US2813803A
Cited
US2930106A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |