Patent US3744547A successfully refreshed from Google Patents.
US3744547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of manufacturing crank-case envelopes for rotary piston internal combustion engines with sintered metal plug support
Assignee: Soc De Constructions Mecaniques Panhard & Levassor fr
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Filing: 1969-12-24
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Granted: 1973-07-10
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Expires: 1989-12-24
Abstract
Abstract The envelope is of cast metal or alloy in which each spark-plug is mounted in a support, preferably externally cylindrical, of a sintered metal or alloy highly resistant to thermal shocks. The support is degassed in vaccum and coated by metallisation with the metal or alloy constituting the envelope. It is then placed as a core in a mould and the metal or alloy of the envelope is cast around it, so affecting a positive and durable bond between the support and the rest of the envelope. The envelope is of aluminimum magesium alloy or pig iron and the support of sintered aluminium, magnesium or nickel including 7 to 8 percent thoria respectively.
Inventors
- 👤 J Panhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:54
CPC Classifications
F; F02; F02B; F02B55/00; F02B55/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
37 words
Method according to claim 1, including subjecting the plug support, prior to its placing in the mold, to coating by metallisation with a thin film of a metal miscible with the metal or alloy constituting said envelope.
Claim 2
Dependent Claim
18 words
Method according to claim 2, including, after said forming step, subjecting the plug support to degassing under vacuum.
Claim 3
Dependent Claim
26 words
Method according to claim 3, wherein the degassing under vacuum is effected under a pressure of the order of 10 4 millibar (or 10 2 pascal).
Claim 4
Dependent Claim
34 words
Method according to claim 1, wherein the crank-case envelope is of aluminium alloy and the plug support substantially of sintered aluminium and including coating said support by metallisation with a thin film of aluminium.
Claim 5
Dependent Claim
34 words
Method according to claim 1, wherein the crank-case envelope is of aluminium alloy and the plug support substantially of sintered aluminium and including coating said support by metallisation with a thin film of copper.
Claim 6
Dependent Claim
15 words
Method according to claim 5, wherein the sintered aluminium includes 5 to 15 percent alumina.
Claim 7
Dependent Claim
34 words
Method according to claim 1, wherein the crank-case envelope is of a magnesium alloy and the support substantially of sintered magnesium and including coating said support by metallisation with a thin film of magnesium.
Claim 8
Dependent Claim
34 words
Method according to claim 1, wherein the crank-case envelope is of a magnesium alloy and the support substantially of sintered magnesium and including coating said support by metallisation with a thin film of aluminium.
Claim 9
Dependent Claim
11 words
Method according to claim 8, wherein the sintered magnesium includes magnesia.
Claim 10
Dependent Claim
40 words
Method according to claim 1, wherein the crank-case envelope is of grey pig iron and the plug support of nickel comprising 7 to 8 percent of thoria, and including coating said support by metallisation with a thin film of copper.
Claim 11
Dependent Claim
41 words
Method according to claim 1, wherein tHe crank-case envelope is of spheroidal graphite cast iron and the plug support of nickel comprising 7 to 8 percent of thoria, and including coating said support by metallisation with a thin film of copper.
Claim 12
Dependent Claim
21 words
Method according to claim 1, wherein the crank-case envelope is constituted of grey pig iron and the plug support of copper-alumina.
Claim 13
Dependent Claim
22 words
Method according to claim 1, wherein the crank-case envelope is constituted of spheroidal graphite cast iron and the plug support of copper-alumina.
Claim 14
Dependent Claim
21 words
Method according to claim 1, wherein the crank-case envelope is constituted of grey pig iron and the plug support of copper-nickel-alumina.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |