US4777487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deterministic access protocol local area network
Assignee: GREYROCK BUSINESS CREDIT A DIVISION OF NATIONSCREDIT COMMERCIAL Corp
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Filing: 1986-07-30
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Granted: 1988-10-11
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Expires: 2006-07-30
Abstract
Abstract A data controller to control passage of data between a plurality of data handling devices comprises a communication link to permit communication of the devices with one another. An indicator is associated with each of the devices to indicate data is to be transmitted from any one of the devices. An inhibitor operates upon a device after it transmits data to inhibit access of that device to the communication link and to the indicator. A reset device is responsive to the indicator to remove the inhibitor when the indicator indicates that no data is to be transmitted.
Inventors
- 👤 P. I. P. Boulton
- 👤 E. S. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:31
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/44
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
A data controller to control passage of data between a plurality of data handling devices comprising communication means to permit communication of said devices with one another, indicator means associated with each of said devices to indicate data is to be transmitted from any one of said devices, inhibit means operable upon a device after transmission of data thereby to inhibit access of that device to said communication means and said indicator means and reset means responsive to said indicator means to remove said inhibit means when said indicator means indicates that no data is to be transmitted, thereby preventing that device from gaining multiple access to said communication means until each of said other requesting handling devices have gained access to said communication means.
Claim 2
Dependent Claim
125 words
A data controller to control passage of data between a plurality of data handling devices comprising communication means to permit communication of said devices with one another, indicator means associated with each of said devices to indicate data is to be transmitted from any one of said devices, inhibit means operable upon a device after transmission of data thereby to inhibit access of that device to said communication means and said indicator means and reset means responsive to said indicator means to remove said inhibit means when said indicator means indicates that no data is to be transmitted, thereby preventing that device from gaining multiple access to said communication means until each of said other requesting handling devices have gained access to said communication means.
Claim 3
Dependent Claim
19 words
A data controller according to claim 1 including override means operable upon said reset means after a predetermined period.
Claim 4
Dependent Claim
48 words
A data controller according to claim 1 wherein said indicator means includes a plurality of state indicators each associated with a respective one of said devices and having an indication output changeable from a first condition to a second condition upon data being transmitted by the respective device.
Claim 5
Dependent Claim
47 words
A data controller according to claim 3 wherein said indication output of said state indicator is changed from said second condition to said first condition upon reception of an access acquired signal indicating that the respective one of said devices has been connected to said communication means.
Claim 6
Dependent Claim
17 words
A data controller according to claim 4 wherein said indication output initiates operation of said inhibit means.
Claim 7
Dependent Claim
40 words
A data controller according to claim 4 wherein the indication outputs of each of said state indicators are applied to said reset means, operation of said reset means being prevented by any of said indication outputs maintaining said second condition.
Claim 8
Dependent Claim
23 words
A data controller according to claim 6 wherein operation of said reset means is prevented during transmission of data on said communication means.
Claim 9
Dependent Claim
20 words
A data controller according to claim 6 further including override means operable upon said reset means after a predetermined period.
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) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |