Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6192115 | Obtaining information about a called telecommunications party | Arthur R. Toy, Christopher Tsai | 2001-02-20 |
| 5956394 | Common treatment of calls from subscribers served by different types of telecommunication equipment | Donald Lee Andruska | 1999-09-21 |
| 5673310 | Hierarchical switch support of services for subscribers of separate centrex exchanges | Donald Lee Andruska | 1997-09-30 |
| 5673311 | Hierarchical switch support of services for subscribers directly served by local exchange carriers | Donald Lee Andruska | 1997-09-30 |
| 5673312 | Control of call features provided to a subscriber by a hierarchical telecommunication switch | Donald Lee Andruska | 1997-09-30 |
| 5668860 | Call screening at a hierarchical switch based on organizational membership of the parties | Donald Lee Andruska | 1997-09-16 |
| 5652790 | Hierarchical switch support of services for subscribers based on organizational membership | Donald Lee Andruska | 1997-07-29 |
| 5646985 | Hierarchical switch support of services for subscribers of independent private branch exchanges | Donald Lee Andruska | 1997-07-08 |
| 5574780 | Controll of call features provided to a subscriber by a hierarchical telecommunication switch | Donald Lee Andruska | 1996-11-12 |
| 5442689 | Apparatus and method for providing services prior to call completion in a telecommuncation system | Anthony Buttitta, Eric A. Duesing, Wayne R. Kalbow, Mark O. Rosstedt | 1995-08-15 |