Hydraulic cylinder

Motors: expansible chamber type – Working member position responsive motive fluid control – Working member carries part within working chamber which...

Reexamination Certificate

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Details

C091S395000, C091S408000, C091S409000, C092S18100P, C092S183000

Reexamination Certificate

active

11148514

ABSTRACT:
A hydraulic cylinder comprising a cylinder, a piston which is adjustable in the cylinder, and at least one pressure connection which is disposed in the vicinity of an end position of the piston and through which a pressure fluid can be introduced into the cylinder, is characterized in that the piston is provided with a valve element which can cooperate with the pressure connection, in order to cover the pressure connection when the piston approaches its end position, and in order to uncover the pressure connection when pressure fluid is introduced into the cylinder.

REFERENCES:
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patent: 3323422 (1967-06-01), Freese
patent: 3440930 (1969-04-01), Olson
patent: 3677141 (1972-07-01), Lagerqvist et al.
patent: 3802319 (1974-04-01), Bridwell et al.
patent: 3999463 (1976-12-01), Greenwood
patent: 4296675 (1981-10-01), Gies
patent: 4862786 (1989-09-01), Boyer et al.
patent: 6382074 (2002-05-01), Migliori
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patent: 1014847 (1957-08-01), None
patent: 3920293 (1991-01-01), None
patent: 29706364 (1997-06-01), None
patent: 19843154 (1999-04-01), None
patent: 1031697 (2000-08-01), None
International Search Report, PCT/EP03/14084.
English Language Abstract of EP1031697 from esp@cenet database.
English Language Abstract of DE 1 014 847.
German Patent and Trademark Office Search Report. DE 202 19 451.5.
English Language Abstract of DE 3920293 from esp@cenet database.

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