Heat treated valve guide and method of making

Metal treatment – Stock – Ferrous

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C148S612000

Reexamination Certificate

active

07628870

ABSTRACT:
A valve guide of alloyed gray cast iron comprising from about 3 to about 3.5 wt. % carbon, about 0.2 wt. % phosphorous maximum, from about 0.35 to about 0.75 wt. % molybdenum, from about 1.8 to about 3 wt. % silicon, from about 0.6 to about 1 wt. % manganese, from about 0.8 to about 1.5 wt. % chromium, balance essentially iron, is heat treated by austenitizing, quenching, and tempering, to obtain a Rockwell C hardness from about 35 to about 45. The microstructure comprises at least about 3% intercellular carbide in a matrix of tempered martensite. Such valve guide exhibits improved wear resistance during use in an internal combustion engine.

REFERENCES:
patent: 1973263 (1934-09-01), Mitchell
patent: 3370941 (1968-02-01), Keuny
patent: 3384515 (1968-05-01), Ackerman
patent: 3472651 (1969-10-01), Keuny
patent: 4032334 (1977-06-01), Burk
patent: 4124413 (1978-11-01), Komatsu
patent: 4230506 (1980-10-01), Clark
patent: 4482396 (1984-11-01), Yamamoto et al.
patent: 4484547 (1984-11-01), Nickerson
patent: 5441024 (1995-08-01), Wietig et al.
patent: 5972128 (1999-10-01), Miwa
European Search Report, dated Apr. 25, 2006 issued for European patent application counterpart of above application.
Abstracts of Japan, Publication No. 2001107173, dated Apr. 17, 2001.
Metals Handbook, 8thEdition, vol. 1, 1961, Properties and Selection of Metals, pp. 363-365, American Society for Metals, Novelty, Ohio.
Metals Handbook, 8thEdition, vol. 2, 1964, Treating, Cleaning, and Finishing, pp. 207-211, American Society for Metals, Metals Park, Ohio.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Heat treated valve guide and method of making does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Heat treated valve guide and method of making, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Heat treated valve guide and method of making will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-4091383

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.