The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 10, 1983
Filed:
Feb. 24, 1981
Gerold Anderka, Ellerbek, DE;
Koh-I-Noor Rapidograph, Inc., Bloomsbury, NJ (US);
Abstract
Tubular writing pens of the stylographic type, particularly a felt tip pen. A cylindrical hollow body supports an ink reservoir at one end and a felt tip which extends from the ink reservoir through the front of the hollow body. The tubular body encompasses the writing element, while defining an inner pressure equalization chamber in its outer wall and a longitudinally extending axial groove in its inner wall, exposed throughout its length to the felt tip writing instrument. An intermediate cylindrical piece complementally engages the exterior wall of the cylindrical body, so as to cover the inner pressure equalization chamber and define in its exterior wall an outer pressure equalization chamber, communicant with the inner chamber. An outer sleeve complementally engages the intermediate piece, so as to cover the outer equalization chamber and define at its posterior end a reservoir seat. An ink reservoir cartridge may complementally engage the outer sleeve and the posterior end of the writing body, so as to communicate with the felt tip writing instrument.