US3777213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dark trace cathode ray tube erase system
Assignee: Fujitsu Services Ltd
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Filing: 1971-11-12
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Granted: 1973-12-04
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Expires: 1991-11-12
Abstract
Abstract A flash erasure system for erasing the display on a dark trace cathode ray tube. The system includes a number of flash tubes which can be selected for operation in a predetermined sequence. This mode of operation allows a cooling and charging period for each tube before it is required to be used again.
Inventors
- 👤 H Hankins
- 👤 I Torsun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:09
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A dark trace cathode ray tube erase system, comprising a plurality of flash tubes each having a triggering electrode and disposable to erase a dark trace cathode ray tube; a recirculating stepping counter having a counter stage for each said tube; the output of each stage being connected to a triggering electrode of the associated tube and arranged such that when any stage of the counter is in a first state in which it is able to apply a triggering pulse to its associate tube to cause the latter to produce a flash, the remaining stages are forced into the opposed state; and a control unit for applying stepping pulses to the counter to cause the latter to apply a triggering signal to each tube in a predetermined sequence.
Claim 2
Dependent Claim
129 words
A dark trace cathode ray tube erase system, comprising a plurality of flash tubes each having a triggering electrode and disposable to erase a dark trace cathode ray tube; a recirculating stepping counter having a counter stage for each said tube; the output of each stage being connected to a triggering electrode of the associated tube and arranged such that when any stage of the counter is in a first state in which it is able to apply a triggering pulse to its associate tube to cause the latter to produce a flash, the remaining stages are forced into the opposed state; and a control unit for applying stepping pulses to the counter to cause the latter to apply a triggering signal to each tube in a predetermined sequence.
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |