Ink level detection system for ink jet printing apparatus
US4639738A · kind A · utility
190Cited by
1References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1985 |
| Grant date | Jan 27, 1987 |
| Priority date | — |
| Expiry date | Apr 12, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/17566
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The detection system includes a cartridge having a first detection port for detecting the pressure condition in the top portion of the cartridge and a second detection port and tube for detecting the pressure condition in a bottom portion of the cartridge. The cooperative printer structure couples these ports to a pressure differential sensor that signals a printer refill condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.