U.S. Patent 7748587 was awarded to Marvzen Kabushiki Kaisha on 2010-07-06 and describes a “Staple refill, stapler and cartridge.” This patent has been cited 257 times by other U.S. patents which places it in the top 500 cited patents since 2010 according to our law firm research, and makes it of the most innovative machine tools patents in the field of mechanical engineering. The abstract states:

A refill for staples, which can not be removed from a cartridge unless all sheet-type connected staples in a stapler body are delivered. A refill for staples is installed in a detachable manner in a stapler body, and includes a refill body which holds the sheet-type connected staples, and a pressing member which presses the sheet-type connected staples. A delivery port delivering the sheet-type connected staples and a locking plate provided with a locking section which locks a locked section in the stapler body are formed in the refill body. When the sheet-type connected staples are pressed, the pressing member is engaged with the locking plate not to allow rotation of the locking plate, and, when the sheet-type connected staples are not pressed, the pressing member is disengaged from the locking plate to allow rotation of the locking plate. Thereby, the locking section of the locking plate can be removed from the locked section in the stapler body. Link: U.S. Patent 7748587

This patent was originally filed on 2004-02-06 which gives it a processing time of 2342 days, compared to an average processing time of 1003 in the field. Marvzen Kabushiki Kaisha has 25 total patents. The first named inventor is Katsunori Manabe of Tokyo, Tokyo. The assistant examiner was Nathaniel Chukwurah.

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