# US 11,440,330 B2 · Liquid delivery in an inkjet type dispenser

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- Number: US 11,440,330 B2
- Document ID: US11440330B2
- Status: Granted
- Kind: B2
- Application number: 16/500,396
- Filed: 2018-07-08
- Published: 2021-10-21
- Granted: 2022-09-13
- Earliest claimed: 2018-07-08
- Assignees: Hewlett-Packard Development Company, L.P.
- Applicants: Hewlett-Packard Development Company, L.P.
- Inventors: Mark A Devries; Paul Mark Haines; Ronald J Ender
- Web page: https://patentgrep.com/patent/US11440330B2

## CPC

- B41J 2/175: Ink supply systems {; Circuit parts therefor}
- B41J 2/18: Ink recirculation systems
- B41J 2/17503: {Ink cartridges}
- B41J 2/17566: {Ink level or ink residue control}
- B41J 2/17596: {Ink pumps, ink valves}
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS

## Abstract

In one example, a liquid delivery system for an inkjet type dispenser includes: a printhead unit; a reservoir separate from the printhead unit; a flow path from the reservoir through the printhead unit and back to the reservoir; an interconnect to connect a removable liquid container to the flow path; and a single pump to pump ink along the flow path: from the reservoir through the printhead unit and back to the reservoir; and from the interconnect to the reservoir when a removable liquid container is connected to the interconnect.

## Claims

### Claim 1

A liquid delivery system for an inkjet type dispenser, comprising:
a printhead unit;
a reservoir separate from the printhead unit;
a flow path from the reservoir through the printhead unit and back to the reservoir;
an interconnect to connect a removable liquid container to the flow path; and
a single pump to pump ink along the flow path:
from the reservoir through the printhead unit and back to the reservoir; and
from the interconnect to the reservoir when the removable liquid container is connected to the interconnect, where the pump is to pull liquid from the reservoir and from the removable liquid container when the container is connected to the interconnect; and
a pressure control device to inhibit the flow of liquid from the reservoir so that a pressure to pull liquid from the reservoir is greater than a pressure to pull liquid from the container connected to the interconnect.

### Claim 2 (depends on 1)

The system of claim 1, where the pump is to pull liquid from the container when the container is connected to the interconnect.

### Claim 3 (depends on 1)

The system of claim 1, comprising a valve operative between a first position to block a flow of liquid from the container connected to the interconnect into the flow path and a second position to not block a flow of liquid from the container connected to the interconnect.

### Claim 4 (depends on 1)

The system of claim 1, where the flow path from the interconnect to the reservoir goes through the printhead unit.

### Claim 5 (depends on 1)

The system of claim 1, comprising the container connected to the interconnect.

### Claim 6 (depends on 1)

The system of claim 1, where the printhead unit comprises a printbar having multiple printheads.

### Claim 7

A liquid delivery system for an inkjet type dispenser, comprising:
a printhead unit;
a reservoir separate from the printhead unit;
a flow path from the reservoir through the printhead unit and back to the reservoir;
an interconnect to connect a removable liquid container to the flow path; and
a pump to pump ink along the flow path:
from the reservoir through the printhead unit and back to the reservoir; and
from the interconnect through the printhead unit to the reservoir when the container is connected to the interconnect, where the pump is to pull liquid from the reservoir and from the container when the container is connected to the interconnect; and
a pressure control device to inhibit the flow of liquid from the reservoir so that a pressure to pull liquid from the reservoir is greater than a pressure to pull liquid from the container connected to the interconnect.

### Claim 8 (depends on 7)

The system of claim 7, where the pump is a single pump.