H04Q 1/39
Using coded pulse groups
Official title: using coded pulse groups
H04Q1/39 (Using coded pulse groups) appears on 16 US grants and 0 published applications in this corpus.
Search patents in H04Q- Granted patents
- 16
- Published applications
- 0
- Assignees
- 13
- Inventors
- 25
- Latest grant
- 31 Aug 1993
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 3 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Telephone system having a dial data changeover switch31 Aug 1993US 5,241,591 ARohm Co., Ltd.
- Method and an apparatus for mutually converting different signaling systems31 Dec 1991US 5,077,735 AElectronics and Telecommunications Research Institute
- Call progress capability for a switched channel data service unit22 Oct 1991US 5,060,259 AIntegrated Network Corporation
- Call progress capability for a switched channel data service unit19 Feb 1991US 4,995,076 AIntegrated Network Corporation
- Asynchronous signaling system for digital communication channel28 Jul 1987US 4,683,567 ABritish Columbia Telephone Company
No published applications in this class yet.
Most cited
By later US patents
- Digital signal generator29US 3,985,965 AGTE Sylvania Incorporated · 1976
- Digital code word detection17US 4,375,102 AU. S. Philips Corporation · 1983
- Method and an apparatus for mutually converting different signaling systems15US 5,077,735 AElectronics and Telecommunications Research Institute · 1991
- Telephone system having a dial data changeover switch14US 5,241,591 ARohm Co., Ltd. · 1993
- Combined analog/digital CCIS data transmitter/receiver circuit11US 4,672,603 AGTE Communication Systems Corporation · 1987