ASSA ABLOY(UK)'s CN Patent on Door-closer is Approved by CNIPA

CNIPA issued a Notice of Approval for Patent lately, which states that the CN patent right titled with "Door-closer" was granted to ASSA ABLOY LTD (a company located in United Kingdom), and the patent numbered is CN201910939587.5.


Beijing CAIHE Law Firm represented ASSA ABLOY on this case before CNIPA.


The abstract of the patent is as follows:

A door-closer comprises a piston that is moveable to change the volume of a first chamber 5 and move fluid between first and second chambers. The door-closer comprises a vacuum valve 225 with an open configuration in which fluid or trapped air can be sucked out of the door closer by applying a vacuum to the vacuum valve, e.g. a syringe or a vacuum pump. The door-closer also comprises an inlet valve 172 with an open configuration in which fluid can be sucked into to the door-closer when the vacuum is applied to the vacuum valve 225. The vacuum valve may have a screw threaded bore 227 in communication the pin piston chamber 211. The bore may have a tapered section and use a ball bearing 230 to block the aperture 228. The system can be used to remove trapped air which may have worked its way into the system in use or as a result of a leak in the cylinder and thus be affecting the performance of the closer.

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