Global patent index - EP 1013473 A1

EP 1013473 A1 2000-06-28 - WRITING UTENSIL

Title (en)

WRITING UTENSIL

Title (de)

SCHREIBGERÄT

Title (fr)

INSTRUMENT D'ECRITURE

Publication

EP 1013473 A1 (EN)

Application

EP 98941787 A

Priority

  • JP 9804050 W
  • JP 24540797 A
  • JP 32125797 A

Abstract (en)

An equalizing tube having an equalizing passage formed therein is inserted in an ink storage chamber such that the front end of the tube communicates with that portion of the ink storage chamber which is located near a pen tip, and the rear end of the tube communicates with the outside. During non-writing, the equalizing passage is made to serve as a feeder and used to compensate expansion/contraction of, for example, air in the ink storage chamber so as to maintain the pressure therein equal to the atmospheric pressure. During writing, a portion near the pen tip is set, using the equalizing passage, under a pressure equal to the atmospheric pressure to prevent the head pressure of ink from being applied to the pen tip. Thus, the head pressure of ink is compensated during writing, thereby applying a constant pressure substantially equal to the atmospheric pressure to the pen tip. Further, expansion/contraction of air, for example, in the ink storage chamber is compensated to maintain the internal pressure of the chamber equal to the atmospheric pressure. <IMAGE>

IPC 1-7 (main, further and additional classification)

B43K 7/02; B43K 7/10; B43K 8/03

IPC 8 full level (invention and additional information)

B43K 7/08 (2006.01)

CPC (invention and additional information)

B43K 7/08 (2013.01)

Citation (search report)

See references of WO 9912752A1

Designated contracting state (EPC)

DE FR GB

EPO simple patent family

EP 1013473 A1 20000628; AU 9000698 A 19990329; CN 1269753 A 20001011; WO 9912752 A1 19990318

INPADOC legal status

2002-10-23 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20020401

2000-06-28 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000301

2000-06-28 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE FR GB