US3849079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallic materials based on martensitic steel
Assignee: Bpifrance Financement SA
•
Filing: 1970-12-15
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Granted: 1974-11-19
•
Expires: 1990-12-15
Abstract
Abstract The material is constituted by a regular alternation of relatively thick layers of martensitic structure and thinner layers of austenitic structure. The product is useful for sheet metal exposed to the action of hydrogen.
Inventors
- 👤 J Montuelle
- 👤 G Chaudron
- 👤 Legry G Piaard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:09
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/22; B23K20/227; B32; B32B; B32B15/00; B32B15/01; B32B15/011; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/925; Y10S428/926; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12632; Y10T428/12771; Y10T428/12861; Y10T428/12944; Y10T428/12951; Y10T428/12958; Y10T428/12965; Y10T428/12986
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
53 words
MASSIVE FERROUS METALLIC MATERIAL HAVING HIGH MECHANICAL STRENGTH AND RESISTANCE IN DEPTH OF THE MATERIAL TO HYDROGEN EMBRITTLEMENT CONSISTING ESSENTIALLY OF A REGULAR ALTERNATION OF A PLURALITY OF LAYERS OF MARTENSITIC STEEL AND OF LAYERS AUSTENITIC STRUCTURE HAVING A RESISTANCE TO CORROSION HIGHER AND A MECHANICAL RESISTANCE LOWER THAN THOSE OF SAID MARTENSIC
Claim 2
Dependent Claim
53 words
MASSIVE FERROUS METALLIC MATERIAL HAVING HIGH MECHANICAL STRENGTH AND RESISTANCE IN DEPTH OF THE MATERIAL TO HYDROGEN EMBRITTLEMENT CONSISTING ESSENTIALLY OF A REGULAR ALTERNATION OF A PLURALITY OF LAYERS OF MARTENSITIC STEEL AND OF LAYERS AUSTENITIC STRUCTURE HAVING A RESISTANCE TO CORROSION HIGHER AND A MECHANICAL RESISTANCE LOWER THAN THOSE OF SAID MARTENSIC
Claim 3
Dependent Claim
20 words
Massive ferrous metallic material according to claim 1 wherein the outer surface thereof comprises a layer of said austenitic Structure.
Claim 4
Dependent Claim
13 words
Metallic material according to claim 1, wherein said magnitude is about ten times.
Claim 5
Dependent Claim
26 words
Metallic material according to claim 1, wherein each of the martensitic layers have the same thickness and each of the austenitic layers have the same thickness.
Claim 6
Dependent Claim
20 words
Metallic material according to claim 1, wherein the martensitic layers have different thicknesses, and the austenitic layers have different thicknesses.
Claim 7
Dependent Claim
16 words
Metallic material according to claim 1, wherein said material is a metal sheet with parallel layers.
Claim 8
Dependent Claim
15 words
Metallic material according to claim 1, wherein said material is a bar with coaxial layers.
Claim 9
Dependent Claim
15 words
Metallic material according to claim 1, wherein said material is a tube with coaxial layers.
Claim 10
Dependent Claim
32 words
Metallic material according to claim 1, wherein the thickness of the martensitic layers is between 1000 and 50 microns and the thickness of the austenitic layers is between 100 and 10 microns.
Claim 11
Dependent Claim
31 words
Iron base material according to claim 1, wherein said layers of austenitic structure are of a material selected from the group consisting of Cr. Ni. austenitic steels, nickel and nickel-base alloys.
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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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |