H04M9/005 - CPC Classification Index

ClassID:

227799 ⎘

H04M9/005 - CPC Classification

Classification description:

Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems with subscriber controlled access to an exchange line

Sub-classes:

H04M9/006 » {Exchange line circuits } 0
H04M9/007 » {wherein the key telephone sets are star-connected to a central unit by a limited number of lines} 3

Recent Application in this class:

20220377180

2022-11-24

Volume control over shared trunk lines in intercom systems

20220124202

2022-04-21

Volume control over shared trunk lines in intercom systems

20090080642

2009-03-26

Enterprise-distributed noise management

13931137

2015-02-03

Extension monitoring in a distributed telephony system