H04Q 3/48
Using markers
Official title: using markers
H04Q3/48 (Using markers) appears on 4 US grants and 0 published applications in this corpus.
Search patents in H04Q- Granted patents
- 4
- Published applications
- 0
- Assignees
- 3
- Inventors
- 8
- Latest grant
- 16 Dec 2003
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 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.
Subgroups
Granted patents
Recent patents
- Conversion of a permanent connection into a signaled permanent connection16 Dec 2003US 6,665,295 B1Alcatel Canada Inc.
- Multiple queue resource management7 May 1996US 5,515,428 AMitel Corporation
- Method and apparatus for testing a subscriber line group marker of a telephone central office cross bar switching device25 Sep 1979US 4,169,221 A
- Apparatus for custom calling features in a telephone system14 Dec 1976US 3,997,731 AInternational Telephone and Telegraph Corporation
No published applications in this class yet.
Most cited
By later US patents
- Apparatus for custom calling features in a telephone system72US 3,997,731 AInternational Telephone and Telegraph Corporation · 1976
- Multiple queue resource management27US 5,515,428 AMitel Corporation · 1996
- Conversion of a permanent connection into a signaled permanent connection17US 6,665,295 B1Alcatel Canada Inc. · 2003