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Expired
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Alfred Julius Boult
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Individual
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Individual
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Publication of GB190117553ApublicationCriticalpatent/GB190117553A/en
17,553. Boult, A. J., [Heston, W.]. Sept. 2. Pistons. -Relates to pistons, especially of the hydraulic piston valve type, employing cupleather packing, the object being to minimize the injury suffered by the leather in passing over ports. The cup-leather C is secured in the usual manner, but, in addition, a perforated disc G is secured to the piston stem having an annular groove which takes over the edge of the leather and prevents it from contacting with the cylinder.
GB190117553D1901-09-021901-09-02Improvements in or relating to Pistons
ExpiredGB190117553A
(en)