Patent US3753869A successfully refreshed from Google Patents.
US3753869A
Expired / Lapsed
US
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Electrochemical recording method
Assignee: International Business Machines Corp
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Filing: 1971-12-20
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Granted: 1973-08-21
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Expires: 1991-12-20
Abstract
Abstract A DOT MATRIX ELECTROCHEMICAL RECORDER PRINTING BY ELECTROLYSIS WHICH INCLUDES PLURAL SILVER ELECTRODE PINS WHICH RUBS AGAINST A PAPER RECORDING MEDIUM IMPREGNATED WITH A CONDUCTIVE SALT SELECTED FROM AN ALKALI, AMMONIUM FLUORIDE AND AMMONIUM OXALATE ALONE WITH A REDUCING AGENT SELECTED FROM ASCORBIC ACID, STANNOUS CHLORIDE, STANNOUS SULFATE, POTASSIUM HYDROXIDE, AND SOME REDUCING PHENOLS AND AMINES, SUCH AS PRAAMINOPHENOL. D R A W I N G
Inventors
- 👤 A Ambrosia
- 👤 C Sambucetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:16
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/20; B41M5/205
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |