US4001839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid jet recorder
Assignee: Siemens AG
•
Filing: 1974-09-30
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Granted: 1977-01-04
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Expires: 1994-09-30
Abstract
Abstract A liquid jet recorder having at least one jet nozzle which is directed towards a recording carrier, and which is connected to a supply pump for the recording liquid. The liquid jet recorder incorporates a liquid-conveying pump which is activated at predetermined intervals for short periods of time between writing periods, so as to practically completely prevent the drying-in of the recording liquid within the jet nozzle.
Inventors
- 👤 Helmut Kraus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:05
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/135; B41J2/165; B41J2/16517; B41J2/1652; B41J2/16526
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
127 words
In a liquid jet recorder having at least one jet nozzle directed towards a recording carrier; and a pump connected to said jet nozzle for supplying recording liquid thereto; an electrical power supply for energizing said pump during recording periods of said recorder, the improvement comprising: a timer switch arrangement connected to said pump; and a switch having first and second positions, said switch connecting said power supply to said pump in said first position, said switch connecting said power supply to said timer switch arrangement in said second position, said timer arrangement being adapted to actuate said pump for short periods of time when said recorder is in a non-recording state whereby recording liquid is pumped to said nozzle during non-recording intervals to avoid nozzle clogging.
Claim 2
Dependent Claim
127 words
In a liquid jet recorder having at least one jet nozzle directed towards a recording carrier; and a pump connected to said jet nozzle for supplying recording liquid thereto; an electrical power supply for energizing said pump during recording periods of said recorder, the improvement comprising: a timer switch arrangement connected to said pump; and a switch having first and second positions, said switch connecting said power supply to said pump in said first position, said switch connecting said power supply to said timer switch arrangement in said second position, said timer arrangement being adapted to actuate said pump for short periods of time when said recorder is in a non-recording state whereby recording liquid is pumped to said nozzle during non-recording intervals to avoid nozzle clogging.
Claim 3
Dependent Claim
22 words
A recorder as claimed in claim 1, said predetermined intervals being of the magnitude ranging from about 1 day to 1 week.
Claim 4
Dependent Claim
21 words
A recorder as claimed in claim 1, said pump being actuated for short periods in the magnitude of a few seconds.
Claim 5
Dependent Claim
29 words
A recorder as claimed in claim 1, comprising a recording liquid suction pad, said jet nozzle being directed towards said suction pad in the inoperative condition of said recorder.
Claim 6
Dependent Claim
16 words
A recorder as claimed in claim 4, said suction pad being exchangeably mounted on said recorder.
Claim 7
Dependent Claim
49 words
A recorder as claimed in claim 1, comprising power supply circuit means for the activation and deactivation of the recording elements of said recorder; and voltage supply means for said timer switch arrangement being connectable to said power supply in the switched-off condition of said power supply circuit means.
References Cited (Backward Citations)
US2628881A
Cited
US3416153A
Cited
US3673601A
Cited
US3661304A
Cited
US3925789A
Cited
US3925788A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |