US4101906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charge electrode assembly for ink jet printer
Assignee: International Business Machines Corp
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Filing: 1977-04-25
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Granted: 1978-07-18
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Expires: 1997-04-25
Abstract
Abstract A charge electrode assembly useful in an ink jet printer comprises a nonconductive supporting structure in which a multiplicity of grooves are formed. Each groove has a conductive layer of a corrosion-resistant noble metal, preferably platinum or rhodium, thereby forming an electrode. An electric power supply is coupled to the electrodes and energizes selected ones of the electrodes when propelled ink droplets traverse the electrode area.
Inventors
- 👤 Mark Sorensen Dahlstrom
- 👤 Paul Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:52
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/07; B41J2/075; B41J2/08; B41J2/085
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
74 words
A charge electrode assembly useful in an ink jet printer comprising: a nonconductive ceramic housing; a series of uniformly spaced grooves formed in said housing; a layer of a corrosion-resistant non-oxidated noble metal applied directly in each of said grooves to said housing ceramic and insulated from each other, said non-oxidated metal being effectively resistant to dissolution that may be caused by anodic and cathodic current in the presence of pressure propelled ink droplets.
Claim 2
Dependent Claim
74 words
A charge electrode assembly useful in an ink jet printer comprising: a nonconductive ceramic housing; a series of uniformly spaced grooves formed in said housing; a layer of a corrosion-resistant non-oxidated noble metal applied directly in each of said grooves to said housing ceramic and insulated from each other, said non-oxidated metal being effectively resistant to dissolution that may be caused by anodic and cathodic current in the presence of pressure propelled ink droplets.
Claim 3
Dependent Claim
29 words
A charge electrode assembly as in claim 1, including conductive means coupled to each electrode, and further including control means for selectively applying an electric voltage to each electrode.
Claim 4
Dependent Claim
19 words
A charge electrode assembly as in claim 1, wherein said layer comprises a thin film of platinum or rhodium.
Claim 5
Dependent Claim
19 words
A charge electrode assembly as in claim 1, wherein said electrode layer comprises a film approximately 1000A in thickness.
Claim 6
Dependent Claim
17 words
A charge electrode assembly as in claim 1, wherein said layer is formed of a singular material.
Claim 7
Dependent Claim
13 words
A charge electrode assembly as in claim 5, wherein such metal is platinum.
Claim 8
Dependent Claim
13 words
A charge electrode assembly as in claim 5, wherein said metal is rhodium.
References Cited (Backward Citations)
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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) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |