US4728495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removable dental appliances
Assignee: Thyssen Stahl AG
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Filing: 1986-03-20
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Granted: 1988-03-01
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Expires: 2006-03-20
Abstract
Abstract The invention relates to removable dental appliances made of cobalt-chromium-cast alloys containing (in % by weight) 0,1 to 1,0% C, 0,05 to 0,5% N, 0,5 to 3,0% Si, 0,3 to 10,0% Mn, 20 to 35% Cr, 2 to 10% Mo, 5 to 40% Fe, at least 20% Cobalt as rest including incidental impurities.
Inventors
- 👤 Leo Rademacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:22
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/07; A; A61; A61K; A61K6/00; A61K6/80; A61K6/84
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
53 words
Removable dental appliances consisting of a cobalt-chromium cast alloy consisting essentially of (in % by weight): 0,1 to 1,0% carbon 0,05 to 0,5% nitrogen 0,5 to 3,0% silicon 0,3 to 10,0% manganese 20 to 35% chromium 2 to 10% molybdenum 5 to 40% iron at least 20% cobalt as residue including incidental impurities.
Claim 2
Dependent Claim
53 words
Removable dental appliances consisting of a cobalt-chromium cast alloy consisting essentially of (in % by weight): 0,1 to 1,0% carbon 0,05 to 0,5% nitrogen 0,5 to 3,0% silicon 0,3 to 10,0% manganese 20 to 35% chromium 2 to 10% molybdenum 5 to 40% iron at least 20% cobalt as residue including incidental impurities.
Claim 3
Dependent Claim
24 words
Removable dental appliances according to claim 1, wherein the content of the sum of carbon and nitrogen in the alloy does not exceed 1%.
Claim 4
Dependent Claim
49 words
Removable dental appliances according to claim 1, wherein the alloy consists of 0,1 to 0,5% carbon 0,05 to 0,5% nitrogen 0,9 to 2% silicon 1 to 6% manganese 26 to 31% chromium 2 to 6% molybdenum 20 to 35% iron at least 20% cobalt as residue including incidental impurities.
Claim 5
Dependent Claim
24 words
Removable dental appliances according to claim 3, wherein the content of the sum of carbon and nitrogen in the alloy does not exceed 1%.
Claim 6
Dependent Claim
25 words
Removable dental appliances according to claim 1 wherein the alloy additionally contains up to 0,5% of at least one of aluminum, boron, columbium and titanium.
Claim 7
Dependent Claim
33 words
Removable dental appliances according to claim 5 wherein the alloy additionally contains at least one member of the group consisting of aluminum, boron, columbium and titanium in amounts of 0.01 to 0.2% each.
Claim 8
Dependent Claim
33 words
Removable dental appliances according to claim 1 wherein the alloy contains higher amounts of the other alloying elements within the given ranges when iron is added in the amount of 25 to 40%.
References Cited (Backward Citations)
US3865585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |