Patent US4293867A successfully refreshed from Google Patents.
US4293867A
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Device for removing air bubbles formed and trapped in ink chamber of print head of ink-jet printer
Assignee: Ricoh Co Ltd
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Filing: 1980-05-06
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Granted: 1981-10-06
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Expires: 2000-05-06
Abstract
Abstract A device for removing air bubbles formed and trapped in an ink chamber of an ink-jet print head, said device comprising a means for sensing the existance of air bubbles in the ink chamber, a means responsive to the output signal from the sensing means for replacing the ink in the ink chamber with an agent having a low surface tension, and a means for replacing the agent filled in the ink chamber with the ink.
Inventors
- 👤 Takuro Isayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:49
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/17; B41J2/19; G; G01; G01D; G01D15/00; G01D15/16; G01D15/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A device for removing air bubbles formed and trapped in an ink chamber of a print head of an ink-jet printer comprising (a) a means for detecting the existence of air bubbles in said ink chamber, (b) a means responsive to the output signal from said detection means for replacing the ink in the ink chamber with a liquid with a small surface tension and a low viscosity, and (c) a means for replacing said liquid in said ink chamber with the ink.
Claim 2
Independent Claim
83 words
A device for removing air bubbles formed and trapped in an ink chamber of a print head of an ink-jet printer comprising (a) a means for detecting the existence of air bubbles in said ink chamber, (b) a means responsive to the output signal from said detection means for replacing the ink in the ink chamber with a liquid with a small surface tension and a low viscosity, and (c) a means for replacing said liquid in said ink chamber with the ink.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |