US4476090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Material for jewelry and commodities and process for its production
Assignee: Evonik Operations GmbH
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Filing: 1984-05-07
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Granted: 1984-10-09
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Expires: 2004-05-07
Abstract
Abstract There is described a new material for jewelry and commodities which has a relatively low density and also is low carat but resistant to oxidation and corrosion. It consists of a noble metal or alloy and 1 to 70 volume % glass, whereby as glass there is used a glass frit having a transformation temperature of 300° to 500° C. and a softening interval of over 80° C. There is also described a process for its production.
Inventors
- 👤 Horst Heidsiek
- 👤 Gernot Jackel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:21
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/0089; B; B22; B22F; B22F3/00; B22F3/12; B22F3/16; B22F3/24; B22F3/26; C03; C03C; C03C14/00; C03C14/004; G; G04; G04B; G04B37/00; G04B37/22; C03C2214/00; C03C2214/04; C03C2214/08
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
112 words
A material suitable for manufacture of jewelry and commodities consisting essentially of at least 30 volume % of a noble metal and 1 to 70 volume % of oxide glass frit, said glass frit having a transformation temperature of 300° to 500° C. and a softening interval of over 80° C., said material having been formed by mixing a noble metal powder with a 1 to 70 volume % of glass frit, pressing at room temperature with a 500 to 5000 bar, then sintering at a temperature of 500° to 800° C. and then heat shaping at a temperature of 500° to 700° C. and a pressure of 100 to 200 bar.
Claim 2
Dependent Claim
112 words
A material suitable for manufacture of jewelry and commodities consisting essentially of at least 30 volume % of a noble metal and 1 to 70 volume % of oxide glass frit, said glass frit having a transformation temperature of 300° to 500° C. and a softening interval of over 80° C., said material having been formed by mixing a noble metal powder with a 1 to 70 volume % of glass frit, pressing at room temperature with a 500 to 5000 bar, then sintering at a temperature of 500° to 800° C. and then heat shaping at a temperature of 500° to 700° C. and a pressure of 100 to 200 bar.
Claim 3
Dependent Claim
33 words
A material according to claim 1 wherein the noble metal is gold, silver, platinum, or palladium or a mixture thereof or their alloys with each other or with copper, nickel, tin, or zinc.
Claim 4
Dependent Claim
26 words
A material according to claim 2 wherein the noble metal is gold, silver, platinum, or palladium or a mixture thereof of their alloys with each other.
Claim 5
Dependent Claim
12 words
A material according to claim 3 wherein the noble metal is gold.
Claim 6
Dependent Claim
12 words
A material according to claim 3 wherein the noble metal is silver.
Claim 7
Dependent Claim
27 words
A material according to claim 1 wherein the glass frit has a transformation temperature of 350° to 450° C. and a softening interval of over 120° C.
Claim 8
Dependent Claim
51 words
A material according to claim 6 wherein the glass frit contains 15 to 75 weight % of lead oxide, zinc oxide, or a mixture of lead oxide and zinc oxide, 5 to 55 weight % silica, 0 to 25 weight % boron oxide and 0 to 20 weight % alkali oxide.
Claim 9
Dependent Claim
51 words
A material according to claim 1 wherein the glass frit contains 15 to 75 weight % of lead oxide, zinc oxide, or a mixture of lead oxide and zinc oxide, 5 to 55 weight % silica, 0 to 25 weight % boron oxide and 0 to 20 weight % alkali oxide.
Claim 10
Dependent Claim
50 words
A material according to claim 8 wherein the glass frit contains in addition at least one of (a) up to 10 weight % aluminum oxide, (b) up to 10 weight % zirconium dioxide, (c) up to 10 weight % titanium dioxide, or (d) up to 10 weight % tin dioxide.
Claim 11
Dependent Claim
50 words
A material according to claim 7 wherein the glass frit contains in addition at least one of (a) 2 to 10 weight % aluminum oxide, (b) 2 to 10 weight % zirconium dioxide, (c) 2 to 10 weight % titanium dioxide, or (d) 2 to 10 weight % tin dioxide.
Claim 12
Dependent Claim
21 words
A material according to claim 10 wherein the glass frit contains lead oxide and also either tin dioxide or zirconium dioxide.
Claim 13
Dependent Claim
17 words
A material according to claim 10 wherein the glass frit has a particle size of ≦50 mμ.
Claim 14
Dependent Claim
17 words
A material according to claim 9 wherein the glass frit has a particle size of ≦50 mμ.
Claim 15
Dependent Claim
17 words
A material according to claim 8 wherein the glass frit has a particle size of ≦50 mμ.
Claim 16
Dependent Claim
17 words
A material according to claim 7 wherein the glass frit has a particle size of ≦50 mμ.
Claim 17
Dependent Claim
17 words
A material according to claim 6 wherein the glass frit has a particle size of ≦50 mμ.
Claim 18
Dependent Claim
17 words
A material according to claim 2 wherein the glass frit has a particle size of ≦50 mμ.
Claim 19
Dependent Claim
17 words
A material according to claim 1 wherein the glass frit has a particle size of ≦50 mμ.
Claim 20
Dependent Claim
15 words
A material according to claim 18 wherein the glass frit is made of spherical particles.
Claim 21
Dependent Claim
15 words
A material according to claim 1 wherein the glass frit is made of spherical particles.
Claim 22
Dependent Claim
14 words
A material according to claim 1 wherein the glass frit contains a coloring pigment.
Claim 23
Dependent Claim
69 words
A process for the production of the material of claim 1 comprising mixing a noble metal powder with 1 to 70 volume % of a glass frit, pressing at room temperature with a pressure of 500 to 5000 bar then sintering at a temperature of 500° to 800° C. and then heat shaping at a temperature of 500° to 700° C. and a pressure of 100 to 200 bar.
Claim 24
Dependent Claim
24 words
A process according to claim 22 wherein the pressing is at 1000 to 3000 bar and the sintering is at 500° to 750° C.
Claim 25
Dependent Claim
38 words
A process according to claim 23 comprising applying a thermal post treatment at a temperature of approximately 400° C. above the transformation temperature of the glass frit to produce a glass coating on the surface of the material.
Claim 26
Dependent Claim
15 words
A material according to claim 1 consisting of the noble metal and the glass frit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |