Patent US3776706A successfully refreshed from Google Patents.
US3776706A
Expired / Lapsed
US
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Aluminum oxide based articles of jewelry
Assignee: EIDP Inc
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Filing: 1971-12-15
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Granted: 1973-12-04
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Expires: 1991-12-15
Abstract
Abstract Fine-grained mixtures of 25 to 75 volume percent refractory aluminum oxide, 25 to 75 volume percent refractory titanium carbide, and 0 to 10 volume percent metal are sintered or hotpressed to form articles of jewelry having low porosity, a metallic-grey appearance, perspiration resistance and a high luster when polished.
Inventors
- 👤 A Daniels
- 👤 R Iler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:14
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/645; C04B35/01; C04B35/10; C04B35/515; C04B35/56; C04B35/5607; C04B35/5611; C30; C30B; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/26; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/927; Y10S75/00; Y10S75/95; Y10S75/951; Y10T; Y10T29/00; Y10T29/49; Y10T29/49579; Y10T29/49584; Y10T29/49588; Y10T29/49597
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
57 words
An article of claim 1 in which the composition consists essentially of 30 to 60 volume percent alumina, 30 to 60 volume percent of titanium carbide and 3 to 10 volume percent of a metal selected from the group consisting of molybdenum, tungsten, niobium, and their alloys with each other and with cobalt, nickel or their mixtures.
Claim 2
Dependent Claim
27 words
An article of claim 1 in which the composition has a porosity of less than 1 percent and an average grain size of less than 2 microns.
Claim 3
Dependent Claim
17 words
An article of claim 2 wherein the metal is a mixture of molybdenum or tungsten with nickel.
Claim 4
Dependent Claim
32 words
An article of claim 1 in which the composition consists essentially of 45 volume percent alumina, 45 volume percent titanium carbide and 10 volume percent of a mixture of molybdenum and nickel.
Claim 5
Dependent Claim
75 words
A hard, polished, homogeneous interdispersion for the exposed outer area of a watch case consisting essentially of 25 to 75 volume percent of alumina, 25 to 75 volume percent of titanium carbide and 0 to 10 volume percent of molybdenum, tungsten, niobium, and their alloys with each other and with cobalt, nickel, or their mixtures, said composition having a porosity of less than 5 percent, and an average grain size of less than 10 microns.
Claim 6
Dependent Claim
61 words
A composition for a watch case of claim 6 in which the composition consists essentially of 30 to 60 volume percent alumina, 30 to 60 volume percent of titanium carbide, and 3 to 10 volume percent of a metal selected from the group consisting of molybdenum, tungsten, niobium, and their alloys with each other and with cobalt, nickel, or their mixtures.
Claim 7
Dependent Claim
31 words
A composition for a watch case of claim 6 in which the composition has a porosity of less than 1 percent and an average grain size of less than 2 microns.
Claim 8
Dependent Claim
22 words
A composition for a watch case of claim 6 in which the metal is a mixture of molybdenum or tungsten with nickel.
Claim 9
Dependent Claim
36 words
A composition for a watch case of claim 6 in which the composition consists essentially of 45 volume percent alumina, 45 volume percent titanium carbide and 10 volume percent of a mixture of molybdenum and nickel.
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |