Patent US4062702A successfully refreshed from Google Patents.
US4062702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for partially insulating surfaces of metal work pieces
Assignee: Evonik Operations GmbH
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Filing: 1975-08-18
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Granted: 1977-12-13
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Expires: 1995-08-18
Abstract
Abstract Portions of the surface area of metal workpieces are insulated in thermochemical treatment by covering the areas with a self-adhering textile tape having metal powder embedded in its adhesive layer.
Inventors
- 👤 Helmut Kunst
- 👤 Christian Scondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:36
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/04; C23C8/00; C23C8/04
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
90 words
A process for insulating portions of the surface area of a metal workpiece which is to be subjected to thermochemical treatment comprising coating predetermined portions of said workpiece with a self-adhesive fibrous textile tape made of organic material, having embedded in the adhesive layer thereof a metal powder and thereafter subjecting the workpiece to thermochemical treatment at a temperature sufficient to destroy said tape, said adhesive layer of the tape having a thickness of 25 to 250 microns and the metal powder having a thickness of 10 to 200 microns.
Claim 2
Dependent Claim
90 words
A process for insulating portions of the surface area of a metal workpiece which is to be subjected to thermochemical treatment comprising coating predetermined portions of said workpiece with a self-adhesive fibrous textile tape made of organic material, having embedded in the adhesive layer thereof a metal powder and thereafter subjecting the workpiece to thermochemical treatment at a temperature sufficient to destroy said tape, said adhesive layer of the tape having a thickness of 25 to 250 microns and the metal powder having a thickness of 10 to 200 microns.
Claim 3
Dependent Claim
15 words
A process according to claim 1 wherein the workpiece is made of iron or steel.
Claim 4
Dependent Claim
17 words
A process according to claim 2 wherein the metal powder comprises copper, tin, silver, nickel or aluminum.
Claim 5
Dependent Claim
33 words
A process according to claim 3 wherein the metal powder also includes lead, cadmium or a mixture of lead and cadmium in an amount of up to 10% of the total metal powder.
Claim 6
Dependent Claim
42 words
A process according to claim 3 wherein the metal powder layer also contains a metal compound which is a metal oxide, metal halide or metal sulfide in an amount of up to 30% of the total of metal powder and metal compound.
Claim 7
Dependent Claim
23 words
A process according to claim 5 wherein the metal compound is an oxide, halide or sulfide of copper, tin, silver, nickel or aluminum.
Claim 8
Dependent Claim
13 words
A process according to claim 6 wherein the metal compound is an oxide.
Claim 9
Dependent Claim
18 words
A process according to claim 1 wherein the thermochemical treatment is either a boriding or a nitriding treatment.
Claim 10
Dependent Claim
11 words
A process according to claim 8 wherein the treatment is boriding.
Claim 11
Dependent Claim
11 words
A process according to claim 8 wherein the treatment is nitriding.
Claim 12
Dependent Claim
17 words
A process according to claim 8 wherein the metal powder comprises copper, tin, silver, nickel or aluminum.
Claim 13
Dependent Claim
21 words
A process according to claim 1 wherein the coating is accomplished by pasting the tape onto the places to be insulated.
Claim 14
Dependent Claim
15 words
A process according to claim 1 wherein the tape is carbonized in the thermochemical treatment.
Claim 15
Dependent Claim
12 words
A process according to claim 1 wherein the thermochemical treatment is vanadiding.
Claim 16
Dependent Claim
12 words
A process according to claim 1 wherein the thermochemical treatment is siliciding.
Claim 17
Dependent Claim
82 words
A process comprising subjecting to thermochemical treatment at a temperature sufficient to destroy the tape thereon a metal workpiece having predetermined areas thereof coated with a self-adhesive fibrous textile tape made of organic material, having embedded in the adhesive layer thereof a metal powder whereby said predetermined areas are insulated when the workpiece is treated thermochemically, the adhesive layer of the tape having a thickness of 25 to 250 microns and the metal powder having a thickness of 10 to 200 microns.
Claim 18
Dependent Claim
82 words
A process comprising subjecting to thermochemical treatment at a temperature sufficient to destroy the tape thereon a metal workpiece having predetermined areas thereof coated with a self-adhesive fibrous textile tape made of organic material, having embedded in the adhesive layer thereof a metal powder whereby said predetermined areas are insulated when the workpiece is treated thermochemically, the adhesive layer of the tape having a thickness of 25 to 250 microns and the metal powder having a thickness of 10 to 200 microns.
Claim 19
Dependent Claim
15 words
A process organic to claim 16 wherein the workpiece is made of iron or steel.
Claim 20
Dependent Claim
15 words
A process according to claim 17 wherein the tape is made of an organic polymer.
Claim 21
Dependent Claim
17 words
A process according to claim 18 wherein the metal powder comprises copper, tin, silver, nickel or aluminum.
Claim 22
Dependent Claim
16 words
A process according to claim 19 wherein the thermochemical treatment is a boriding or nitriding treatment.
Claim 23
Dependent Claim
81 words
A metal workpiece made of iron or steel suitable for thermochemical treatment having predetermined areas thereof coated with a self-adhesive fibrous textile tape made of organic material, having embedded in the adhesive layer thereof a metal powder comprising copper, tin, silver, nickel or aluminum whereby said predetermined areas will be insulated when the workpiece is treated thermochemically, the tape adhesive layer having a thickness of 25 to 250 microns and the metal powder having a thickness of 10 to 200 microns.
Claim 24
Dependent Claim
81 words
A metal workpiece made of iron or steel suitable for thermochemical treatment having predetermined areas thereof coated with a self-adhesive fibrous textile tape made of organic material, having embedded in the adhesive layer thereof a metal powder comprising copper, tin, silver, nickel or aluminum whereby said predetermined areas will be insulated when the workpiece is treated thermochemically, the tape adhesive layer having a thickness of 25 to 250 microns and the metal powder having a thickness of 10 to 200 microns.
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) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |