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US4131720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heavy-duty heat-responsive bimetallic material
Assignee: G RAU GmbH and Co KG
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Filing: 1977-03-16
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Granted: 1978-12-26
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Expires: 1997-03-16
Abstract
Abstract The bimetallic material comprises a laminate of two materials, one having a high coefficient of thermal expansion, one with a low coefficient of thermal expansion. The material with the high coefficient of expansion is a corrosion resisting and heat resisting austenitic chromium-nickel steel, while the material with the low coefficient of expansion is a heat hardenable alloy of iron, nickel, cobalt and titanium and/or aluminium. It is found that this combination of materials gives rise to a bimetallic material capable of heavy duty applications without the disadvantages normally associated with such heavy duty materials.
Inventors
- 👤 Heinz Spengler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:19
CPC Classifications
G; G12; G12B; G12B1/00; G12B1/02; B; B32; B32B; B32B15/00; B32B15/01; B32B15/011; H; H01; H01H; H01H37/00; H01H37/02; H01H37/32; H01H37/52; H01H2037/526; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/125; Y10T428/12521; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12958
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
116 words
A heavy-duty heat-responsive bimetallic material which comprises at least one metallic component of a material having a high coefficient of thermal expansion joined to a further metallic component of a material having a relatively low coefficient of thermal expansion, the material having a high coefficient of thermal expansion being a corrosion and heat resisting austenitic chromium-nickel steel consisting essentially of 14-26% by weight of chromium and 6-36% by weight of nickel, the remainder being iron and melt impurities and the material having the relatively low coefficient of thermal expansion being a thermally hardenable iron-nickel-titanium alloy consisting essentially of 30-55% by weight of nickel, 1-5% by weight of free titanium, the remainder being iron and melt impurities.
Claim 2
Dependent Claim
116 words
A heavy-duty heat-responsive bimetallic material which comprises at least one metallic component of a material having a high coefficient of thermal expansion joined to a further metallic component of a material having a relatively low coefficient of thermal expansion, the material having a high coefficient of thermal expansion being a corrosion and heat resisting austenitic chromium-nickel steel consisting essentially of 14-26% by weight of chromium and 6-36% by weight of nickel, the remainder being iron and melt impurities and the material having the relatively low coefficient of thermal expansion being a thermally hardenable iron-nickel-titanium alloy consisting essentially of 30-55% by weight of nickel, 1-5% by weight of free titanium, the remainder being iron and melt impurities.
Claim 3
Dependent Claim
121 words
A heavy-duty heat-responsive bimetallic material which comprises at least one metallic component of a material having a high coefficient of thermal expansion joined to a further metallic component of a material having a relatively low coefficient of thermal expansion, the material having a high coefficient of thermal expansion being a corrosion and heat resisting austenitic chromium-nickel steel consisting essentially of 14-26% by weight of chromium and 6-36% by weight of nickel, the remainder being iron and melt impurities and the material having the relatively low coefficient of thermal expansion being a thermally hardenable iron-nickel-cobalt-titanium alloy consisting essentially of 26-39% by weight of nickel, 3-16% by weight of cobalt, 1-5% by weight of free titanium, the remainder being iron and melt impurities.
Claim 4
Dependent Claim
121 words
A heavy-duty heat-responsive bimetallic material which comprises at least one metallic component of a material having a high coefficient of thermal expansion joined to a further metallic component of a material having a relatively low coefficient of thermal expansion, the material having a high coefficient of thermal expansion being a corrosion and heat resisting austenitic chromium-nickel steel consisting essentially of 14-26% by weight of chromium and 6-36% by weight of nickel, the remainder being iron and melt impurities and the material having the relatively low coefficient of thermal expansion being a thermally hardenable iron-nickel-cobalt-titanium alloy consisting essentially of 26-39% by weight of nickel, 3-16% by weight of cobalt, 1-5% by weight of free titanium, the remainder being iron and melt impurities.
Claim 5
Dependent Claim
87 words
A heavy-duty heat-responsive bimetallic material according to claim 2 wherein the material having a high coefficient of thermal expansion is a corrosion and heat resisting austenitic chromium-nickel-steel consisting essentially of 18% by weight of chromium and 8% by weight of nickel, the remainder being iron and melt impurities and the material having the relatively low coefficient of thermal expansion is a thermally hardenable iron-nickel-cobalt-titanium alloy consisting essentially of 32% by weight of nickel, 14.5% by weight of cobalt, 1.6% by weight of titanium and the remainder iron.
Claim 6
Dependent Claim
82 words
A bimetallic material according to claim 2 wherein the material having the high coefficient of thermal expansion is a chromium-nickel steel having 18% by weight of chromium and 8% by weight of nickel, the remainder being iron, and the material having the low coefficient of thermal expansion is a thermally hardenable iron-nickel-cobalt-titanium alloy containing 34% by weight of nickel, 6% by weight of cobalt, 1.5% by weight of free titanium and up to 0.03% by weight of carbon, the remainder being iron.
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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) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |