Pressure control apparatus for an ink pen
US5526030A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 1992 |
| Grant date | Jun 11, 1996 |
| Priority date | — |
| Expiry date | Oct 5, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/17553
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The back pressure of an ink pen is maintained by providing a capillary member adjacent a bubble generator. Regardless of the orientation of the pen, the capillary member maintains a quantity of ink adjacent an orifice defined by the bubble generator. The quantity of ink serves to supply a liquid seal formed in the orifice. As the back pressure within the ink pen rises to its maximum level, the liquid seal within the orifice is overcome and ambient air bubbles into the reservoir to lower the back pressure. As the back pressure returns to a desirable point, ink trapped by the capillary member enters the orifice to reseal the orifice.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.