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US5426458A
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Poly-p-xylylene films as an orifice plate coating
Assignee: Hewlett Packard Development Co LP
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Filing: 1993-08-09
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Granted: 1995-06-20
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Expires: 2013-08-09
Abstract
Abstract A poly-p-xylylene coating has been found to demonstrate superior properties as a thermal ink-jet adhesive material in combination with resistor assemblies employed in thermal ink-jet printheads. This material evidences better adhesion for securing the orifice plate to the barrier material used to form the ink firing chambers within the printhead and superior corrosion resistance to thermal ink-jet inks, compared to other coating materials.
Inventors
- 👤 Donald E. Wenzel
- 👤 Michael G. Groh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:49
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/16; B41J2/1606; C; C08; C08G; C08G61/00; C08G61/02; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T29/00; Y10T29/49; Y10T29/49401
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
146 words
An improved method of making thermal ink-jet printheads for thermal ink-jet printers, said thermal-ink printhead constructed by providing a plurality of resistor elements, each resistor element defining a geometric plane and formed in an ink firing chamber into which ink is periodically introduced from a plenum and from which ink is periodically ejected through a nozzle comprising orifices disposed in an orifice plate above said elements, said ink firing chamber defined by a barrier material each orifice associated with a resistor element for firing a quantity of ink normal to the geometric plane of each said resistor element and through said orifices toward a print medium in defined patterns to form alphanumeric characters and graphics thereon, wherein the improvement comprises the step of securing the orifice plate to the barrier material used to form the ink firing chambers with a coating consisting essentially of a poly-p-xylylene.
Claim 2
Dependent Claim
146 words
An improved method of making thermal ink-jet printheads for thermal ink-jet printers, said thermal-ink printhead constructed by providing a plurality of resistor elements, each resistor element defining a geometric plane and formed in an ink firing chamber into which ink is periodically introduced from a plenum and from which ink is periodically ejected through a nozzle comprising orifices disposed in an orifice plate above said elements, said ink firing chamber defined by a barrier material each orifice associated with a resistor element for firing a quantity of ink normal to the geometric plane of each said resistor element and through said orifices toward a print medium in defined patterns to form alphanumeric characters and graphics thereon, wherein the improvement comprises the step of securing the orifice plate to the barrier material used to form the ink firing chambers with a coating consisting essentially of a poly-p-xylylene.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein said orifice plate consists essentially of electroformed nickel.
Claim 4
Dependent Claim
17 words
The method of claim 2 wherein said orifice plate ranges in thickness from 25 to 75 μm.
Claim 5
Dependent Claim
35 words
The method of claim 1 wherein said orifice plate has both a top surface and a bottom surface, and wherein said poly-p-xylylene is applied onto both said top and bottom surfaces of said orifice plate.
Claim 6
Dependent Claim
16 words
The method of claim 4 wherein said coating ranges from about 0.5 to 5 μm thick.
Claim 7
Dependent Claim
16 words
The method of claim 5 wherein said coating ranges from about 1 to 2 μm thick.
Claim 8
Dependent Claim
32 words
The method of claim 6 wherein said coating on said orifice plate is ashed by using an argon or oxygen plasma treatment prior to securing said cover plate to said barrier material.
Claim 9
Dependent Claim
23 words
The method of claim 1 wherein said coating consists essentially of a poly-p-xylylene selected from the group consisting of poly-p-xylylene, poly(monochloro-p-xylylene), and poly(dichloro-p-xylylene).
Claim 10
Dependent Claim
12 words
The method of claim 8 wherein said coating consists essentially of poly(monochloro-p-xylylene).
Claim 11
Dependent Claim
103 words
A thermal ink-jet printhead including: (a) a substrate; (b) a barrier layer supported thereon provided with openings to define a firing chamber having a resistor element therein and barrier inlet channel to introduce ink from an ink refill slot to said firing chamber; and (c) an orifice plate having a top surface and a bottom surface and provided with a plurality of nozzles, each nozzle associated with a resistor element, said bottom surface of said orifice plate secured to said barrier layer by a coating of a poly-p-xylylene, and said top surface of said orifice plate provided with a coating of a poly-p-xylylene.
Claim 12
Dependent Claim
103 words
A thermal ink-jet printhead including: (a) a substrate; (b) a barrier layer supported thereon provided with openings to define a firing chamber having a resistor element therein and barrier inlet channel to introduce ink from an ink refill slot to said firing chamber; and (c) an orifice plate having a top surface and a bottom surface and provided with a plurality of nozzles, each nozzle associated with a resistor element, said bottom surface of said orifice plate secured to said barrier layer by a coating of a poly-p-xylylene, and said top surface of said orifice plate provided with a coating of a poly-p-xylylene.
Claim 13
Dependent Claim
16 words
The thermal ink-jet printhead of claim 10 wherein said orifice plate consists essentially of electroformed nickel.
Claim 14
Dependent Claim
19 words
The thermal ink-jet printhead of claim 11 wherein said orifice plate material ranges from 25 to 75 μm thick.
Claim 15
Dependent Claim
18 words
The thermal ink-jet printhead of claim 10 wherein said coating ranges from about 0.5 to 5 μm thick.
Claim 16
Dependent Claim
18 words
The thermal ink-jet printhead of claim 10 wherein said coating ranges from about 1 to 2 μm thick.
Claim 17
Dependent Claim
25 words
The thermal ink-jet printhead of claim 14 wherein said coating consists essentially of a poly-p-xylylene selected from the group consisting of poly-p-xylylene, poly(monochloro-p-xylylene), and poly(dichloro-p-xylylene).
Claim 18
Dependent Claim
14 words
The thermal ink-jet printhead of claim 15 wherein said coating consists essentially of poly(monochloro-p-xylylene).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-06-19 | 1998-12-19 | 1999-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-06-19 | 2002-12-19 | 2003-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-06-19 | 2006-12-19 | 2007-06-20 | $7700.00 | Window Closed / Lapsed |