B - Operations – Transporting – 41 – J
Patent
B - Operations, Transporting
41
J
B41J 2/175 (2006.01) B41J 27/20 (2006.01) B43K 5/18 (2006.01) B43K 8/04 (2006.01)
Patent
CA 2323258
A porous material such as polyurethane foam is compressed to form skeletal portions in a three-dimensional network and mutually communicated pores or passages. The passages are closed at the skeletal portions by contacting the skeletal portions with each other so that valve caps are formed for closing the passages. Thus formed valve body is applicable to pen tips for writing instruments and printer heads for ink jet printers.
Enuma Kouichi
Kato Yasuo
Kawasaki Masayuki
Nagahama Masamitsu
Shimizu Tsutomu
Marks & Clerk
Pentel Kabushiki Kaisha
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