Stem sealing for high pressure valve or the like

- Gray Tool Company
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Claims

Referenced Cited
U.S. Patent Documents
3049082 August 1962 Barry
3135285 June 1964 Volpin
3288473 November 1966 Hinds
3307826 March 1967 Lowrey
3325173 June 1967 Alt
3544064 December 1970 Carlin
3572735 March 1971 Dryer
3578341 May 1971 LeFebrve
3599991 August 1971 Combes et al.
3883112 May 1975 Milleville et al.
Foreign Patent Documents
60,954 February 1955 FR
2,109,502 August 1972 DT
216,573 May 1924 UK
704,032 February 1954 UK
907,935 October 1962 UK
1,098,173 January 1968 UK
1,221,045 February 1971 UK
1,371,009 October 1974 UK
Other references
  • Drilling-DCW Magazine-Aug. 1973-p. 50673.
Patent History
Patent number: RE29679
Type: Grant
Filed: Sep 15, 1977
Date of Patent: Jun 27, 1978
Assignee: Gray Tool Company (Houston, TX)
Inventor: Boyd D. Boitnott (Jasper, AR)
Primary Examiner: Martin P. Schwadron
Assistant Examiner: G. L. Walton
Law Firm: Cushman, Darby & Cushman
Application Number: 5/833,605
Classifications
Current U.S. Class: Particularly Packed Or Sealed (251/214); 277/72FM
International Classification: F16k 3144;