US3575433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston ring for an internal-combustion engine and method for making same
Assignee: Goetzewerke Friedrich Goetze AG
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Filing: 1969-01-17
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Granted: 1971-04-20
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Expires: 1989-01-17
Abstract
Abstract A piston ring has a bearing surface layer first mechanically applied thereto which is subsequently alloyed thereto by electron bombardment.
Inventors
- 👤 Horst Beyer
- 👤 Hans Kling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:08
CPC Classifications
F; F16; F16J; F16J9/00; F16J9/26; B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3053; B23K35/306; C; C23; C23C; C23C10/00; C23C10/28; C23C26/00; C23C26/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49274
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
29 words
A piston ring, particularly for internal-combustion engines, formed of a ferrous material and provided with a bearing surface layer which is substantially alloyed thereto by means of electron bombardment.
Claim 2
Dependent Claim
29 words
A piston ring, particularly for internal-combustion engines, formed of a ferrous material and provided with a bearing surface layer which is substantially alloyed thereto by means of electron bombardment.
Claim 3
Dependent Claim
21 words
A piston ring as defined in claim 1 wherein said bearing surface layer is ground to produce the required surface roughness.
Claim 4
Dependent Claim
27 words
A piston ring as defined in claim 1 wherein a second bearing surface layer is alloyed to the first bearing surface layer by means of electron bombardment.
Claim 5
Dependent Claim
22 words
A piston ring as defined in claim 3 wherein said second bearing surface layer is ground to produce the required surface roughness.
Claim 6
Dependent Claim
41 words
A piston ring as defined in claim 1 wherein said bearing surface layer is formed of material taken from the group consisting of chromium, chromium carbide, molybdenum, tungsten, tungsten carbide, boron carbide, titanium, aluminum oxide, silicon carbide, rhenium, osmium and nickel.
Claim 7
Dependent Claim
49 words
Method of providing a bearing surface layer on a piston ring, formed of a ferrous material, for an internal combustion engine, comprising, in combination: a. mechanically applying a bearing surface layer to said piston ring; b. alloying the bearing surface layer to said ring by a bombardment of electrons.
Claim 8
Dependent Claim
49 words
Method of providing a bearing surface layer on a piston ring, formed of a ferrous material, for an internal combustion engine, comprising, in combination: a. mechanically applying a bearing surface layer to said piston ring; b. alloying the bearing surface layer to said ring by a bombardment of electrons.
Claim 9
Dependent Claim
47 words
Method of making a piston ring as defined in claim 6 comprising the further steps of mechanically applying a second bearing surface layer to the first bearing surface layer and alloying said second bearing surface layer to said first bearing surface layer by a bombardment of electrons.
Claim 10
Dependent Claim
78 words
Method of making a piston ring as defined in claim 7, the first of the bearing surface layers being chromium, the step of mechanically applying a second bearing surface layer including spraying molybdenum onto the chromium, the steps of alloying the chromium and the molybdenum being done in a one-time bombardment with electrons for strongly alloying the surface of the ferrous material with the chromium and simultaneously for strongly alloying the surface of the chromium with the molybdenum.
Claim 11
Dependent Claim
24 words
Method of making a piston ring as defined in claim 6 wherein said bearing surface layer is mechanically applied to said piston by spraying.
Claim 12
Dependent Claim
17 words
Method of making a piston ring as defined in claim 9, said bearing surface layer being molybdenum.
Claim 13
Dependent Claim
25 words
Method of making a piston ring as defined in claim 6 wherein said bearing surface layer is mechanically applied to said piston by galvanic deposition.
Claim 14
Dependent Claim
17 words
Method of making a piston ring as defined in claim 11 said bearing surface layer being chromium.
Claim 15
Dependent Claim
45 words
Method of making a piston ring as defined in claim 6 wherein said bearing surface layer is formed of a material taken from the group consisting of chromium, chromium carbide, molybdenum tungsten, tungsten carbide, boron carbide, titanium, aluminum oxide, silicon carbide, rhenium, osmium and nickel.
Claim 16
Dependent Claim
23 words
Method of making a piston as defined in claim 6 comprising further the step of grinding said bearing surface layer to required roughness.
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |