US3865585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cobalt chromium based alloy
Assignee: Edelstahlwerk Witten AG
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Filing: 1973-05-22
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Granted: 1975-02-11
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Expires: 1993-05-22
Abstract
Abstract A cobalt/chromium based alloy suitable for use in making dental prostheses and surgical implants, and also for use in making machine parts which are subject to severe corrosive conditions and mechanical loads at high temperatures, comprises by weight, 26 percent to 31 percent chromium, from 4 percent to 6.5 percent molybdenum, up to 2 percent silicon, up to 6 percent maganese, up to 1 percent iron, up to 0.5 percent boron, up to 0.5 percent carbon, from 0.15 percent to 0.5 percent nitrogen, and the remainder cobalt except for impurities, the sum of the carbon and nitrogen contents not exceeding 0.7 percent.
Inventors
- 👤 Leo Rademacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:07
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/07; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
72 words
AN ALLOY CONSISTING ESSENTIALLY OF FROM 26 PERCENT TO 31 PERCENT CHROMIUM, FROM 4 PERCENT TO 6.5 PERCENT MOLYBDENUM, UP TO 2 PERCENT SILICON, UP TO 6 PERCENT MANGANESE, UP TO 1 PERCENT IRON, UP TO 0.5 PERCENT BORON, UP TO 0.5 PERCENT CARBON, FROM 0.15 PERCENT TO 0.5 PERCENT NITROGEN, WITH THE BALANCE BEING COBALT AND IMPURITIES, THE SUM OF SAID CARBON CONTENT AND SAID NITROGEN CONTENT NOT EXCEEDING 0.7 PERCENT.
Claim 2
Dependent Claim
72 words
AN ALLOY CONSISTING ESSENTIALLY OF FROM 26 PERCENT TO 31 PERCENT CHROMIUM, FROM 4 PERCENT TO 6.5 PERCENT MOLYBDENUM, UP TO 2 PERCENT SILICON, UP TO 6 PERCENT MANGANESE, UP TO 1 PERCENT IRON, UP TO 0.5 PERCENT BORON, UP TO 0.5 PERCENT CARBON, FROM 0.15 PERCENT TO 0.5 PERCENT NITROGEN, WITH THE BALANCE BEING COBALT AND IMPURITIES, THE SUM OF SAID CARBON CONTENT AND SAID NITROGEN CONTENT NOT EXCEEDING 0.7 PERCENT.
Claim 3
Dependent Claim
17 words
An alloy as claimed in claim 1, wherein said silicon content is no more than 1.5 percent.
Claim 4
Dependent Claim
17 words
An alloy as claimed in claim 1, wherein said manganese content is no more than 3 percent.
Claim 5
Dependent Claim
18 words
An alloy as claimed in claim 1, wherein said nitrogen content is from 0.2 percent to 0.35 percent.
Claim 6
Dependent Claim
17 words
An alloy as claimed in claim 1, wherein said carbon content is no more than 0.2 percent.
Claim 7
Dependent Claim
22 words
An alloy as claimed in claim 1, wherein said silicon content and said maganese content are each no more than 1 percent.
Claim 8
Dependent Claim
18 words
An alloy as claimed in claim 1, wherein said boron content is from 0.01 percent to 0.15 percent.
Claim 9
Dependent Claim
12 words
A dental prosthesis made from an alloy as claimed in claim 1.
Claim 10
Dependent Claim
12 words
A surgical implant made from an alloy as claimed in claim 1.
Claim 11
Dependent Claim
11 words
A machine component made from an alloy as claimed in claim
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) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |