Patent US460918A successfully refreshed from Google Patents.
Patent US4698804A successfully refreshed from Google Patents.
US4698804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shared data transmission system
Assignee: TELEPHONE AND TELEGRAPH COMPANY AT&T BELL LABS
•
Filing: 1985-01-22
•
Granted: 1987-10-06
•
Expires: 2005-01-22
Abstract
Abstract A digital transmission system includes a plurality of stations sharing a common transmission line. Variable length messages, set off by flags, are exchanged between pairs of stations. While a message is being received, the downstream portion of the transmission line is segmented to permit simultaneous use by another station pair. If a message is received from an upstream station while a message is being transmitted downstream, an abort message flag terminates the transmitted message abruptly to permit flowthrough of the received message. When any station is not in use or out of order, it is bypassed to permit use of the transmission line by the rest of the stations.
Inventors
- 👤 Christopher Flores
- 👤 Bhaskarpillai Gopinath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:01
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/42; H04L12/427; H04L12/433
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A common line transmission system comprising a plurality of stations connected by a common transmission medium, means at each of said stations for launching messages on said medium, each said message including a header identifying the source and destination of said message, means at each of said stations for disconnecting a transmitting side of said station from said medium during message reception, means at each of said stations for aborting a partial message in the process of being transmitted in response to the reception of another message at said station, and means for transmitting, at a later time, the aborted portion only of said partial message together with a header identifying the source and destination of said aborted portion.
Claim 2
Dependent Claim
119 words
A common line transmission system comprising a plurality of stations connected by a common transmission medium, means at each of said stations for launching messages on said medium, each said message including a header identifying the source and destination of said message, means at each of said stations for disconnecting a transmitting side of said station from said medium during message reception, means at each of said stations for aborting a partial message in the process of being transmitted in response to the reception of another message at said station, and means for transmitting, at a later time, the aborted portion only of said partial message together with a header identifying the source and destination of said aborted portion.
References Cited (Backward Citations)
US4225753A
Cited
US4514841A
Cited
US4439763A
Cited
US4500987A
Cited
US4519068A
Cited
US4566097A
Cited
US4567590A
Cited
US4637014A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-05 | 1991-04-06 | 1991-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-05 | 1995-04-06 | 1995-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-05 | 1999-04-06 | 1999-10-06 | $7700.00 | Window Closed / Lapsed |