H04Q 2213/173
Busy signal
H04Q2213/173 (Busy signal) appears on 4 US grants and 0 published applications in this corpus.
Search patents in H04Q- Granted patents
- 4
- Published applications
- 0
- Assignees
- 2
- Inventors
- 3
- Latest grant
- 10 Jun 2003
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Call waiting response status10 Jun 2003US 6,577,722 B1Agere Systems Inc.
- Communication apparatus providing improved information on the states of data channels15 Jul 1997US 5,648,971 ACanon Kabushiki Kaisha
- Communication apparatus for responding to calls to a different apparatus on a network10 Dec 1996US 5,583,930 ACanon Kabushiki Kaisha
- Communication apparatus with improved sub-address recall5 Nov 1996US 5,572,580 ACanon Kabushiki Kaisha
No published applications in this class yet.
Most cited
By later US patents