H04Q 2213/14
Busy test
Official title: Busy test, e.g. marking busy
H04Q2213/14 (Busy test) appears on 5 US grants and 0 published applications in this corpus.
Search patents in H04Q- Granted patents
- 5
- Published applications
- 0
- Assignees
- 4
- Inventors
- 6
- Latest grant
- 10 Sep 1996
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1993 | 1 | 0 |
| 1994 | 3 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Communication method and apparatus10 Sep 1996US 5,555,294 ACanon Kabushiki Kaisha
- Method of controlling parameter downloading from a communication switching system to customer stations11 Oct 1994US 5,355,404 AAT&T Bell Laboratories
- Electronic switching system for use in connection to an ISDN and method of setting communication disconnection reasons19 Apr 1994US 5,305,313 AKabushiki Kaisha Toshiba
- Adaptive switching of multimedia audio and video information in an ISDN line5 Apr 1994US 5,301,191 ACanon Kabushiki Kaisha
- ISDN terminal equipment control method7 Dec 1993US 5,268,904 ARicoh Company, Ltd.
No published applications in this class yet.
Most cited
By later US patents
- Method of controlling parameter downloading from a communication switching system to customer stations23US 5,355,404 AAT&T Bell Laboratories · 1994
- Adaptive switching of multimedia audio and video information in an ISDN line22US 5,301,191 ACanon Kabushiki Kaisha · 1994
- ISDN terminal equipment control method20US 5,268,904 ARicoh Company, Ltd. · 1993
- Communication method and apparatus7US 5,555,294 ACanon Kabushiki Kaisha · 1996
- Electronic switching system for use in connection to an ISDN and method of setting communication disconnection reasons5US 5,305,313 AKabushiki Kaisha Toshiba · 1994