R. DALE PELFREY TRUSTEE OF THE R. DALE PELFREY TRUST

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
 
 
F01L CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES 253

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
9518482 Internal combustion engineJun 02, 14Dec 13, 16[F01L]
8151755 Internal combustion engineSep 23, 11Apr 10, 12[F01L]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
8347841 Internal combustion engineExpiredMar 29, 12Jan 08, 13[F01L]

Top Inventors for This Owner

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