§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
EP0320165A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Ink jet pen having improved ink storage and distribution capabilities

Assignee: HP Inc
•
Filing: 1988-11-29
•
Granted: —
•
Expires: 2008-11-29
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract An ink jet pen (10) (or other similar fluid delivery system) wherein primary and secondary ink reservoirs (12,26) and an ink jet printhead (36) are all interconnected by way of a porous ink-transfer member 24). The ink will pass directly from the primary ink reservoir (12) to the printhead (36) under a normal or predetermined range of temperatures and pressures. However, for temperatures and pressures outside this range, the secondary reservoir (26) will be brought into operation to give or receive ink to or from the porous ink transfer member (24) and thereby serve to maintain a substantially constant backpressure at the printhead (36).

Inventors

  • 👤 Bruce Cowger
  • 👤 Robert Beeson

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-31 04:35
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/17; B41J2/175; B41J2/17503; B41J2/17513

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 38 words
A fluid delivery system characterised in that it includes a primary reservoir (12), a secondary reservoir (26) and an orifice plate, all linked by a fluid flow path, wherein the fluid flow path comprises a porous member (24).
Claim 2
Dependent Claim 38 words
A fluid delivery system characterised in that it includes a primary reservoir (12), a secondary reservoir (26) and an orifice plate, all linked by a fluid flow path, wherein the fluid flow path comprises a porous member (24).
Claim 3
Dependent Claim 20 words
The fluid delivery system defined in claim 1 wherein the orifice plate is part of an ink jet printhead (36).
Claim 4
Dependent Claim 37 words
The fluid delivery system defined in claims 1 or 2 wherein the primary and secondary reservoirs (12,26) are bounded by a common wall (18) having an opening (22) therein for passing fluid to the porous member (24).
Claim 5
Dependent Claim 40 words
The fluid delivery systems defined in claim 3 wherein a sill (34) extends from the common wall (18) into the porous member (24) to increase the local capillarity thereof and to increase the pressure differential within the porous member (24).
Claim 6
Dependent Claim 17 words
The system defined in claim 8 wherein the porous member (24) is made of a foam material.

References Cited (Backward Citations)

US3967286A Cited
US4673955A Cited
DE3640032A1 Cited

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag