Patent US3760405A successfully refreshed from Google Patents.
US3760405A
Expired / Lapsed
US
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Character display system utilizing circulating memories
Assignee: Fujitsu Ltd
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Filing: 1971-12-20
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Granted: 1973-09-18
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Expires: 1991-12-20
Abstract
Abstract In a character display system having an electronic computer for providing code informations, a keyboard provides input informations. A control arrangement couples the computer and the keyboard to a display system. The control arrangement comprises a circulating memory coupled to the computer and the keyboard for storing informations from the computer and from the keyboard. First and second marker signal circulating memories circulate first and second marker signals synchronously with the circulating memory. Delimiting signals for delimiting the computer are supplied from the keyboard. The first and second marker signal circulating memories are adapted to be used independently by the delimiting signals.
Inventors
- 👤 A Ishii
- 👤 S Hashimoto
- 👤 T Ono
- 👤 K Adachi
- 👤 M Murakami
- 👤 Y Hagiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:21
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/08; G06; G06F; G06F3/00; G06F3/01; G06F3/048; G06F3/0487; G06F3/0489; G06F3/04892; G06F3/14; G06F3/153
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
109 words
In a character display system having an electronic computer for providing code informations, a keyboard for providing input informations, and a display system, a control arrangement coupling the computer and the keyboard to the display system and comprising circulating memory means coupled to the computer and the keyboard for storing informations from the computer and from the keyboard, first and second marker signal circulating memories for circulating first and second marker signals synchronously with the circulating memory means, and means for supplying delimiting signals for delimiting the computer from the keyboard, said first and second marker signal circulating memories being adapted to be used independently by said delimiting signals.
Claim 2
Dependent Claim
109 words
In a character display system having an electronic computer for providing code informations, a keyboard for providing input informations, and a display system, a control arrangement coupling the computer and the keyboard to the display system and comprising circulating memory means coupled to the computer and the keyboard for storing informations from the computer and from the keyboard, first and second marker signal circulating memories for circulating first and second marker signals synchronously with the circulating memory means, and means for supplying delimiting signals for delimiting the computer from the keyboard, said first and second marker signal circulating memories being adapted to be used independently by said delimiting signals.
Claim 3
Dependent Claim
52 words
A control arrangement as claimed in claim 1, further comprising gate means connected to the first and second marker signal circulating memories for controlling the restorage of marker signals to be circulated, and means for supplying the delimiting signals to the gate means for controlling the conductive condition of the gate means.
Claim 4
Dependent Claim
63 words
A control arrangement as claimed in claim 2, further comprising an inverter, and wherein the delimiting signals are ''''1'''' and ''''0'''' and are supplied to the gate means of one of the first and second marker signal circulating memories via the inverter, the marker signals to be circulated being restored when the delimiting signal ''''1'''' is transferred by each of the gate means.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |