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| Number | Title | Issue Date |
| 7065196 | Entrance intercom system An entrance intercom system comprises the following elements. A data base is applied to store the resident codes, the phone numbers and the identity recognizing codes of the residents. A communication module is coupled with public switch telephone networks to provid... | 06/20/2006 |
| 6671360 | Intercom system for a building or apartment house An intercom system for a building or apartment house includes at least one main entrance station 1 which is installed at an entrance or the like of a building or an apartment house, a plurality of residential master stations 2 which are respectively insta... | 12/30/2003 |
| 6058174 | Automatic intercom system for buildings A semi-automatic or a fully automatic intercom system. These intercom systems are hardwired intercom systems which cannot be used with telephone lines. The semi-automatic intercom system can be used with any kind of lobby panel including a lobby panel equ... | 05/02/2000 |
