US3847685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxide coated metal discs and method of making the same
Assignee: Texas Instruments Inc
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Filing: 1970-02-11
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Granted: 1974-11-12
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Expires: 1990-02-11
Abstract
Abstract Metal materials and elements such as stainless steel diaphragms and the like are immersed in oxidizing, fused, alkali metal hydroxide baths to provide the metal materials with adherent metal oxide coatings to protect the metal materials from abrasion.
Inventors
- 👤 R Baboian
- 👤 P Fiore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:22
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/70; C23C22/72; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S428/9265; Y10S428/929; Y10T; Y10T428/00; Y10T428/12; Y10T428/1241; Y10T428/12493; Y10T428/125; Y10T428/12521; Y10T428/12535; Y10T428/12611; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12958; Y10T428/12965
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
96 words
A METHOD FOR MAKING AN IMPROVED SNAP-ACTING ELEMENT COMPRISING THE STEPS OF PROVIDING A METAL MATERIAL HAVING AT LEAST ONE SURFACE LAYER THEREOF FORMED OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF THE METALS AND ALLOYS SET FORTH IN TABLE I, SAID SURFACE LAYER BEING FREE OF OXIDE SCALE, AND IMMERSING SAID METAL MATERIAL IN AN OXIDIZING BATH COMPRISING FUSED ALKALI METAL HYDROXIDE FOR FORMING AN ABRASION-RESISTANT METAL OXIDE COATING ON SAID SURFACE LAYER, AND DEFORMING SAID METAL MATERIAL TO PROVIDE SAID METAL MATERIAL WITH A PORTION OF DISHED CONFIGURATION FOR FORMING A SNAP-ACTING ELEMENT.
Claim 2
Independent Claim
96 words
A METHOD FOR MAKING AN IMPROVED SNAP-ACTING ELEMENT COMPRISING THE STEPS OF PROVIDING A METAL MATERIAL HAVING AT LEAST ONE SURFACE LAYER THEREOF FORMED OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF THE METALS AND ALLOYS SET FORTH IN TABLE I, SAID SURFACE LAYER BEING FREE OF OXIDE SCALE, AND IMMERSING SAID METAL MATERIAL IN AN OXIDIZING BATH COMPRISING FUSED ALKALI METAL HYDROXIDE FOR FORMING AN ABRASION-RESISTANT METAL OXIDE COATING ON SAID SURFACE LAYER, AND DEFORMING SAID METAL MATERIAL TO PROVIDE SAID METAL MATERIAL WITH A PORTION OF DISHED CONFIGURATION FOR FORMING A SNAP-ACTING ELEMENT.
Claim 3
Dependent Claim
34 words
A method as set forth in claim 1 wherein said metal material is deformed to provide said portion of dished configuration prior to said immersion of said metal material in said fused oxidizing bath.
Claim 4
Dependent Claim
31 words
A method as set forth in claim 1 wherein said oxidizing bath comprises fused materials selected from the group consisting of alkali metal hydroxides, alkali metal nitrates and alkali metal chlorides.
Claim 5
Dependent Claim
37 words
A method as set forth in claim 3 wherein said oxidizing bath comprises, by weight, from 7 to 32 percent alkali metal nitrate, from 1 to 20 percent alkali metal chloride and the balance alkali metal hydroxide.
Claim 6
Dependent Claim
31 words
A method as set forth in claim 4 wherein said oxidizing bath comprises, by weight, approximately 70 percent sodium hydroxide, approximately 20 percent sodium nitrate, and approximately 10 percent sodium chloride.
Claim 7
Dependent Claim
65 words
A method as set forth in claim 5 wherein said fused bath is maintained at a selected temperature in the range from 650* to 850* F. and said metal material is immersed in said bath for a period of time selected in accordance with FIG. 4, said time being in the range indicated by curves A and B in FIG. 4 for said selected temperature.
Claim 8
Dependent Claim
42 words
A method as set forth in claim 6 wherein said metal material comprises a multi-layer metallic material having at least one surface layer thereof formed of a metal material selected from the group of metals and alloys set forth in Table I.
Claim 9
Dependent Claim
83 words
An improved snap-acting element comprising a core formed of a metal material having at least one surface layer thereof of a material selected from the group consisting of the metals and alloys set forth in Table I, said core having at least a portion thereof of dished configuration providing said element with snap-acting properties and having an adherent metal oxide coating of at least about 100 Angstrom units thickness on said surface layer of said core providing said surface layer with improved abrasion-resistance.
Claim 10
Dependent Claim
83 words
An improved snap-acting element comprising a core formed of a metal material having at least one surface layer thereof of a material selected from the group consisting of the metals and alloys set forth in Table I, said core having at least a portion thereof of dished configuration providing said element with snap-acting properties and having an adherent metal oxide coating of at least about 100 Angstrom units thickness on said surface layer of said core providing said surface layer with improved abrasion-resistance.
Claim 11
Dependent Claim
18 words
A snap-acting element as set forth in claim 8 wherein said metal material comprises a multilayer metal material.
References Cited (Backward Citations)
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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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |