Patent US3289649A successfully refreshed from Google Patents.
US3289649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary piston engine
Assignee: Daimler Benz AG
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Filing: 1964-09-22
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Granted: 1966-12-06
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Expires: 1984-09-22
Abstract
No abstract record available.
Inventors
- 👤 Lamm Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:43
CPC Classifications
F; F02; F02B; F02B55/00; F02B55/08; F02B77/00; F02B77/02; Y; Y10; Y10S; Y10S417/00; Y10S417/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
IN A ROTARY PISTON INTERNAL COMBUSTION ENGINE OF TROCHOIDAL CONSTRUCTION, WHICH COMPRISES A CASING, A POLYGONAL PISTON ROTATABLE WITHIN SAID CASING AND HAVING SEALING STRIPS AT THE CORNERS THEREOF, AND OUTLET MEANS IN SAID CASING, A SPRAYED-ON RELATIVELY HARD METAL LAYER ON THE INSIDE OF THE HOUSING CASING SERVING AS INNER RUNNER SURFACES FOR THE ROTATING PISTON AND FILLER MEANS ESSENTIALLY CONSISTING OF A SYNTHETIC RESIN APPLIED TO SAID LAYER FOR CLOSING THE PORES THEREOF, SAID FILLER MEANS HAVING ADMIXED THERETO OVER AT LEAST A PORTION OF THE RUNNER SURFACES A SUBSTANCE WITH LUBRICATING PROPERTIES, THE IMPROVEMENT ESSENTIALLY CONSISTING OF OPERATING SAID ENGINE DURING A SHORT RUNNING-IN PERIOD WITH THE USE OF A PLAIN RUNNING-IN OIL TO ADAPT THE SEALING STRIPS TO SAID INNER RUNNER SURFACES.
Claim 2
Dependent Claim
126 words
IN A ROTARY PISTON INTERNAL COMBUSTION ENGINE OF TROCHOIDAL CONSTRUCTION, WHICH COMPRISES A CASING, A POLYGONAL PISTON ROTATABLE WITHIN SAID CASING AND HAVING SEALING STRIPS AT THE CORNERS THEREOF, AND OUTLET MEANS IN SAID CASING, A SPRAYED-ON RELATIVELY HARD METAL LAYER ON THE INSIDE OF THE HOUSING CASING SERVING AS INNER RUNNER SURFACES FOR THE ROTATING PISTON AND FILLER MEANS ESSENTIALLY CONSISTING OF A SYNTHETIC RESIN APPLIED TO SAID LAYER FOR CLOSING THE PORES THEREOF, SAID FILLER MEANS HAVING ADMIXED THERETO OVER AT LEAST A PORTION OF THE RUNNER SURFACES A SUBSTANCE WITH LUBRICATING PROPERTIES, THE IMPROVEMENT ESSENTIALLY CONSISTING OF OPERATING SAID ENGINE DURING A SHORT RUNNING-IN PERIOD WITH THE USE OF A PLAIN RUNNING-IN OIL TO ADAPT THE SEALING STRIPS TO SAID INNER RUNNER SURFACES.
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) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |