Sanford Gmbh

Rotring International Gmbh & Co. Kg

Koh-i-noor Inc.

Bernd Bastiansen

Wolfgang Witz

Ralf Polley

Gerold D Anderka

Hans-Joachim Ahrens

Petra Maurer

A free ink marking instrument for dispensing an ink, including a housing, a reservoir for storing ink within the housing, a feed tube to convey ink communicating with the reservoir, a tip disposed within the feed tube for conveying ink to a substrate at a marking end of the tip, a porous buffer disposed within the housing adjacent the feed tube and configured for storing ink during periods of a decreasing pressure differential between the reservoir and the atmosphere, and bubble separation area in the form of either a hole in the feed tube or a hole or passage formed between the feed tube and the tip, is disclosed.

Free ink system

A free ink marking instrument for dispensing a fluid is disclosed. The instrument includes a feeder, a passage of reduced capillarity surrounding the feeder for conveying at least one of fluid and air to the reservoir during an increasing pressure differential between air in the reservoir and the atmosphere, a porous buffer configured for storing ink during periods of a decreasing pressure differential between air in the reservoir and the atmosphere, and a divider tube separating the buffer and the passage along a majority of the length of the buffer. The fluid and air may enter the feeder through a minor surrounding portion of the buffer during the period of the increasing pressure differential. An ink and air conveyor for use in a free ink marking instrument is also disclosed. A method for compensating for changes in ambient temperature and pressure in a free ink marking instrument is also disclosed.

A free ink marking instrument for dispensing a fluid. The instrument includes a feeder, a passage of reduced capillarity surrounding the feeder for conveying at least one of fluid and air to the reservoir during an increasing pressure differential between air in the reservoir and the atmosphere, a porous buffer configured for storing ink during periods of a decreasing pressure differential between air in the reservoir and the atmosphere, and a divider tube separating the buffer and the passage along a majority of the length of the buffer. The fluid and air may enter the feeder through a minor surrounding portion of the buffer during the period of the increasing pressure differential. An ink and air conveyor for use in a free ink marking instrument is also disclosed. A method for compensating for changes in ambient temperature and pressure in a free ink marking instrument is also disclosed.

Ink writing implement

Writing implement for ink

An ink writing implement has a front part with a writing tip that comes into contact with the writing substrate, and a writing fluid cartridge whose interior chamber containing the writing fluid is tightly sealed before being put into use, and which is connected to the front part during use. There is also provided an equalization system disposed inside a housing and connected by one end to the interior chamber of the writing fluid cartridge and by the other end with the outside air. The writing fluid cartridge and front part are rigidly attached to one another. The front part can be inserted into the equalization system through a back opening and moved into a position in which it protrudes beyond the front opening in the housing.

A unitary plotter pen construction useful as a disposable plotter pen. A writing tube is provided centrally and at the front end of a unitary hard plastic body element that defines a writing tube nib; a housing for a soft plastic pressure equalization chamber and an ink reservoir; and an adaptor structure for mounting with a plotter head. An axially extending pressure-equalization chamber is defined by soft plastic, lamella vent channel element that is inserted from the rear and axially against inner surfaces of the hard plastic body element. An upper end of the pressure-equalization chamber connects to the ink supply and a lower end connects to ambient air, through an annular cavity at the front end of the unitary body element. That annular cavity also may include transverse capillary spaces as a further protection against ink leakage from the pressure equalization chamber.

Growing community of inventors

Wedel, Germany

Bernd Bastiansen