Patent US4254401A successfully refreshed from Google Patents.
US4254401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Local device in a control information transfer system
Assignee: Fujitsu Ltd
•
Filing: 1977-06-28
•
Granted: 1981-03-03
•
Expires: 1997-06-28
Abstract
Abstract In a control information transfer system in which a central device and a plurality of local devices are respectively interconnected through a control information bus, the local devices are designed to be used in common to the case of the control information bus having the configuration of serial connection suitable for a small system and the case of the control information bus having the configuration of parallel connection suitable for a large system. This is realized by the addition of a very small amount of hardware.
Inventors
- 👤 Hatsuo Murano
- 👤 Yoshio Yamamuro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:38
CPC Classifications
G; G06; G06F; G06F13/00; G06F13/38
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
115 words
A local device for operation with both serial and parallel control information transfer systems having a central device interconnected by a control information bus to a plurality of local devices, each local device comprising: a gate circuit, which becomes conductive either when a control information bus construction indicating information signal has a value indicating that the control information bus is in its parallel configuration with respect to the connection between the central device and the local devices or when a select out signal is transmitted by the central device; and a control information transmitting part for transmitting control information, connected to the central device through said gate circuit, by means of said control information bus.
Claim 2
Dependent Claim
115 words
A local device for operation with both serial and parallel control information transfer systems having a central device interconnected by a control information bus to a plurality of local devices, each local device comprising: a gate circuit, which becomes conductive either when a control information bus construction indicating information signal has a value indicating that the control information bus is in its parallel configuration with respect to the connection between the central device and the local devices or when a select out signal is transmitted by the central device; and a control information transmitting part for transmitting control information, connected to the central device through said gate circuit, by means of said control information bus.
Claim 3
Dependent Claim
14 words
A device as in claim 1, wherein said gate circuit comprises an AND gate.
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) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |