Four-stroke engine
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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May 5, 2015
Grant Date -
Jun 27, 2013
app pub date -
Nov 29, 2012
filing date -
Dec 22, 2011
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A four-stroke engine is provided to lubricate driving parts including a crankshaft and valve operating members while circulating oil, using pressure fluctuation in a crank chamber, the pressure fluctuation being caused by reciprocating motion of a piston. A cam driving parts move with rotation of the crankshaft; a driving chamber and a rocker chamber are connected to one another; the rocker chamber is connected to the crank chamber and a gas-liquid separator; the oil accumulated in a tank is sucked up into the crank chamber and circulated through each part of the four-stroke engine; the crank chamber and the driving chamber are connected to one another via a communicating passage and a return passage; and the crank chamber and the driving chamber connected to one another via the return passage communicate with one another only when the piston is located in a vicinity of the top dead center.
First Claim
Other Claims data not available
Family
| Country | kind | publication No. | Filing Date |
|---|---|---|---|
| JP | B2 | JP5826017 | Dec 22, 2011 |
| EP | B1 | EP2607637 | Dec 11, 2012 |
| CN | B | CN103174492 | Dec 21, 2012 |
International Classification(s)
- 2012 Application Filing Year
- F01M Class
- 182 Applications Filed
- 154 Patents Issued To-Date
- 84.62 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 2 Citation Count
- F01M Class
- 16.39 % this patent is cited more than
- 10 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Nov 5, 2026 |
