US5012120A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Load control system and method for disconnecting sub-bus from main-bus
Assignee: Mitsubishi Electric Corp
•
Filing: 1990-04-30
•
Granted: 1991-04-30
•
Expires: 2010-04-30
Abstract
Abstract Load control system is for disconnecting abnormal sub-bus from main-bus; The load control system has switching circuit (50+51) for connecting the sub-bus (1A, 1B . . . 1N) to the main-bus (2) or disconnecting sub-bus (1A, 1B, . . . 1N) from the main-bus (2) and bus watch device (30A, 30B . . . 30N) for detecting abnormal state of the sub-bus and for operating the switching circuit to disconnect the abnormal sub-bus from the main-bus (2).
Inventors
- 👤 Yoshiji Minagawa
- 👤 Hiroshi Shirakawa
- 👤 Hiroshi Yamazaki
- 👤 Yoshiaki Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:08
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/40; H04L12/40006; H04L12/40032; H04L41/00; H04L41/06; H04L41/0654; H04L43/00; H04L43/08; H04L43/0805; H04L43/0811; H04L43/0823; H04L69/00; H04L69/40; H04L12/46; H04L12/4604; H04L12/462; H04L12/4625
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A method for detecting and disconnecting an abnormal sub-bus from a main-bus in a data network system comprising: disconnecting a sub-bus from the main-bus by operating a switching circuit when an abnormal detection signal is issued in a detecting circuit for detecting an abnormal signal sent to the sub-bus, discriminating whether the sub-bus is abnormal or not by receiving a signal from a controller connected to the sub-bus when the sub-bus is disconnected, connecting the sub-bus to the main-bus by operating the switching circuit when the sub-bus is not abnormal, and maintaining the switching circuit open when the sub-bus is abnormal.
Claim 2
Independent Claim
101 words
A method for detecting and disconnecting an abnormal sub-bus from a main-bus in a data network system comprising: disconnecting a sub-bus from the main-bus by operating a switching circuit when an abnormal detection signal is issued in a detecting circuit for detecting an abnormal signal sent to the sub-bus, discriminating whether the sub-bus is abnormal or not by receiving a signal from a controller connected to the sub-bus when the sub-bus is disconnected, connecting the sub-bus to the main-bus by operating the switching circuit when the sub-bus is not abnormal, and maintaining the switching circuit open when the sub-bus is abnormal.
Claim 3
Independent Claim
99 words
A method for substantially disconnecting an abnormal sub-bus from a main-bus in a data network system comprising the steps of: detecting an abnormal signal on the main-bus by a main-bus watch device; connecting said sub-buses to said main-bus in a predetermined sequence with a switching circuit in response to the detection of said abnormal signal; discriminating whether a signal on the main-bus is normal or abnormal when said sub-buses are connecting to said main-bus in said predetermined pattern; identifying an abnormal sub-bus based on the determination that said signal is abnormal; and disconnecting the abnormal sub-bus from said main-bus.
Claim 4
Independent Claim
99 words
A method for substantially disconnecting an abnormal sub-bus from a main-bus in a data network system comprising the steps of: detecting an abnormal signal on the main-bus by a main-bus watch device; connecting said sub-buses to said main-bus in a predetermined sequence with a switching circuit in response to the detection of said abnormal signal; discriminating whether a signal on the main-bus is normal or abnormal when said sub-buses are connecting to said main-bus in said predetermined pattern; identifying an abnormal sub-bus based on the determination that said signal is abnormal; and disconnecting the abnormal sub-bus from said main-bus.
Claim 5
Dependent Claim
39 words
A method for substantially disconnecting an abnormal sub-bus from a main-bus in accordance with claim 2, wherein: said predetermined sequence includes connecting all of said sub-buses to said main-bus and successively disconnecting each of said sub-buses from the main-bus.
Claim 6
Dependent Claim
37 words
A method for substantially disconnecting abnormal sub-bus from main-bus in accordance with claim 2, wherein: said predetermined sequence includes disconnecting all of said sub-buses from said main-bus and successively connecting each of said sub-buses to the main-bus.
References Cited (Backward Citations)
US3211860A
Cited
US3264435A
Cited
US3296564A
Cited
FR1423090A
Cited
US3569635A
Cited
US3689886A
Cited
US4039757A
Cited
US4145734A
Cited
US4175238A
Cited
US4206443A
Cited
GB2022374A
Cited
US4276637A
Cited
US4241330A
Cited
US4471232A
Cited
US4506357A
Cited
EP0064906A1
Cited
US4489386A
Cited
US4612534A
Cited
US4540890A
Cited
US4583088A
Cited
US4568919A
Cited
EP0133760A2
Cited
US4623884A
Cited
US4541031A
Cited
JPS6122494A
Cited
US4663691A
Cited
US4665544A
Cited
US4639609A
Cited
US4771423A
Cited
US4701630A
Cited
US4752698A
Cited
US4689708A
Cited
US4779261A
Cited
US4899142A
Cited
US4769807A
Cited
US4817080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-29 | 1994-10-29 | 1995-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-29 | 1998-10-29 | 1999-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-29 | 2002-10-29 | 2003-04-30 | $7700.00 | Window Closed / Lapsed |