H04Q 2213/405
Voice frequency current used for digit selection
H04Q2213/405 (Voice frequency current used for digit selection) appears on 3 US grants and 0 published applications in this corpus.
Search patents in H04Q- Granted patents
- 3
- Published applications
- 0
- Assignees
- 3
- Inventors
- 8
- Latest grant
- 17 Oct 1995
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Apparatus for interfacing analog telephone in ISDN terminal adapter17 Oct 1995US 5,459,788 ASamsung Electronics Co., Ltd.
- Apparatus for providing an ISDN to analog interface19 Apr 1994US 5,305,377 ASun Microsystems, Inc.
- Simultaneous voice and data system using the existing two-wire inter-face25 May 1993US 5,214,650 AAG Communication Systems Corporation
No published applications in this class yet.
Most cited
By later US patents
- Simultaneous voice and data system using the existing two-wire inter-face157US 5,214,650 AAG Communication Systems Corporation · 1993
- Apparatus for interfacing analog telephone in ISDN terminal adapter29US 5,459,788 ASamsung Electronics Co., Ltd. · 1995
- Apparatus for providing an ISDN to analog interface18US 5,305,377 ASun Microsystems, Inc. · 1994