Patent EP0077570A1 successfully refreshed from Google Patents.
US3926539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary piston internal combustion engine
Assignee: Daimler Benz AG
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Filing: 1973-05-08
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Granted: 1975-12-16
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Expires: 1993-05-08
Abstract
Abstract A rotary piston internal combustion engine of trochoidal construction which consists of at least one housing casing, two lateral parts and possibly one or several intermediate parts; at least one of two mutually abutting contact surfaces of the housing parts are provided with a soft thin metallic or synthetic plastic coating which has a layer thickness of at most 0.2 mm prior to the assembly of the housing parts and is able to withstand temperatures of the order of 200* C.
Inventors
- 👤 Heinz Lamm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:59
CPC Classifications
F; F02; F02B; F02B53/00; F02B2053/005; F02B2730/00; F02B2730/01; F02B2730/018; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
83 words
A rotary piston internal combustion engine including several rotary piston internal combustion engine housing parts having at least two mutually abutting contact surfaces and consisting of at least one housing casing means and two lateral parts, characterized in that at least one of said mutually abutting contact surfaces of the rotary piston internal combustion engine housing parts is provided with a synthetic plastic coating which coating provides a seal between said contact surfaces, which seal contacts both of said mutually abutting contact surfaces.
Claim 2
Dependent Claim
83 words
A rotary piston internal combustion engine including several rotary piston internal combustion engine housing parts having at least two mutually abutting contact surfaces and consisting of at least one housing casing means and two lateral parts, characterized in that at least one of said mutually abutting contact surfaces of the rotary piston internal combustion engine housing parts is provided with a synthetic plastic coating which coating provides a seal between said contact surfaces, which seal contacts both of said mutually abutting contact surfaces.
Claim 3
Dependent Claim
29 words
A rotary piston internal combustion engine according to claim 1, characterized in that the coating is a deformable foil which is compressible by about 50% of its uncompressed thickness.
Claim 4
Dependent Claim
31 words
A rotary piston internal combustion engine according to claim 1, characterized in that only one of the mutually abutting contact surfaces of the respective housing parts is provided with the coating.
Claim 5
Dependent Claim
31 words
A rotary piston internal combustion engine according to claim 1, characterized in that both of said two mutually abutting contact surfaces of the respective housing parts are provided with said coating.
Claim 6
Dependent Claim
22 words
A rotary piston internal combustion engine according to claim 1, characterized in that the housing parts include at least one intermediate part.
Claim 7
Dependent Claim
24 words
A rotary piston internal combustion engine according to claim 1, characterized in that the coating is compressed between the two mutually abutting contact surfaces.
Claim 8
Dependent Claim
40 words
A rotary piston internal combustion engine according to claim 1, characterized in that said coating has a maximum layer thickness of about 0.2 mm prior to assembly of the housing parts and is able to withstand temperatures of about 200*C.
Claim 9
Dependent Claim
94 words
A rotary piston internal combustion engine including several rotary piston internal combustion engine housing parts having at least two mutually abutting contact surfaces and consisting of at least one housing casing means and two lateral parts, characterized in that at least one of said two mutually abutting contact surfaces of the rotary piston engine housing parts is provided with a coating consisting of a member selected from the group consisting of tin, zinc and lead which coating provides a seal between said contact surfaces, which seal contacts both of said mutually abutting contact surfaces.
Claim 10
Dependent Claim
94 words
A rotary piston internal combustion engine including several rotary piston internal combustion engine housing parts having at least two mutually abutting contact surfaces and consisting of at least one housing casing means and two lateral parts, characterized in that at least one of said two mutually abutting contact surfaces of the rotary piston engine housing parts is provided with a coating consisting of a member selected from the group consisting of tin, zinc and lead which coating provides a seal between said contact surfaces, which seal contacts both of said mutually abutting contact surfaces.
Claim 11
Dependent Claim
20 words
A rotary piston internal combustion engine according to claim 8, characterized in that the coating is a thin metallic coating.
Claim 12
Dependent Claim
21 words
A rotary piston internal combustion engine according to claim 8, characterized in that the coating contains an added fine metallic powder.
Claim 13
Dependent Claim
24 words
A rotary piston internal combustion engine according to claim 8, characterized in that the seal is compressible to about 50% of its uncompressed thickness.
Claim 14
Dependent Claim
38 words
A rotary piston internal combustion engine according to claim 11, characterized in that both of said two mutually abutting contact surfaces of the respective housing parts are provided with said seal, between which surfaces the seal is compressed.
Claim 15
Dependent Claim
28 words
A rotary piston internal combustion engine according to claim 8, characterized in that the engine further includes a rotary piston which is contained within said several housing parts.
Claim 16
Dependent Claim
23 words
A rotary piston internal combustion engine according to claim 8, characterized in that the seal directly contacts both of said two contact surfaces.
Claim 17
Dependent Claim
23 words
A rotary piston internal combustion engine according to claim 12, characterized in that the seal directly contacts both of said two contact surfaces.
Claim 18
Dependent Claim
24 words
A rotary piston internal combustion engine according to claim 8, characterized in that thE coating is compressed between the two mutually abutting contact surfaces.
Claim 19
Dependent Claim
40 words
A rotary piston internal combustion engine according to claim 8, characterized in that said coating has a maximum layer thickness of about 0.2 mm prior to assembly of the housing parts and is able to withstand temperatures of about 200*C.
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) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |