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Class Information
Number: 379/187
Name: Telephonic communications > Polystation line system (i.e., party line) > Connected to central office
Description: Subject matter wherein a polystation line is connected to a central switching office.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6707797 |
Multi-line telephony via network gateways |
Mar. 16, 2004 |
| 6681005 |
Device for manufacturing liquid crystal display panel |
Jan. 20, 2004 |
| 6430273 |
System and method of providing a bi-directional DSL connection |
Aug. 6, 2002 |
| 6185430 |
Voice call group function for a satellite based air traffic control system |
Feb. 6, 2001 |
| 5822417 |
Phone control center for a life safety network |
Oct. 13, 1998 |
| 5461670 |
Telephone subscriber system incorporating a drive interface for a telephone line switch at a different reference potential |
Oct. 24, 1995 |
| 5182768 |
Digital telephone set capable of being simultaneously used by a plurality of persons by using one transmission line |
Jan. 26, 1993 |
| 4310723 |
Party line apparatus |
Jan. 12, 1982 |
| 4293738 |
Analog access arrangement for a digital telephone office |
Oct. 6, 1981 |
| 4113985 |
Mine dial and page phone system |
Sep. 12, 1978 |
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