G02F 2201/125
Delta-beta
Official title: delta-beta
G02F2201/125 (Delta-beta) appears on 27 US grants and 4 published applications in this corpus.
Search patents in G02F- Granted patents
- 27
- Published applications
- 4
- Assignees
- 20
- Inventors
- 36
- Latest grant
- 29 Nov 2011
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 3 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 3 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 1 |
| 2010 | 1 | 0 |
| 2011 | 2 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Fabrication-tolerant waveguides and resonators29 Nov 2011US 8,068,706 B2Massachusetts Institute of Technology
- Wide free-spectral-range, widely tunable and hitless-switchable optical channel add-drop filters4 Oct 2011US 8,032,027 B2Massachusetts Institute of Technology
- Fabrication-tolerant waveguides and resonators14 Dec 2010US 7,853,108 B2Massachusetts Institute of Technology
- Electro-optic modulators with internal impedance matching21 Jun 2005US 6,909,817 B2Avanex Corporation
- Electro-optic modulators with internal impedance matching13 Jul 2004US 6,763,151 B1Avanex Corporation
- Fabrication-tolerant waveguides and resonators3 Feb 2011US 2011/0026879 A1Massachusetts Institute of Technology
- Wide Free-Spectral-Range, Widely Tunable and Hitless-Switchable Optical Channel Add-Drop Filters3 Sep 2009US 2009/0220228 A1Massachusetts Institute of Technology
- Fabrication-tolerant waveguides and resonators10 Jul 2008US 2008/0166095 A1Massachusetts Institute of Technology
- Electro-optic modulators with internal impedance matching9 Dec 2004US 2004/0247220 A1Avanex Corporation
Most cited
By later US patents
- Semiconductor rib waveguide optical modulator with heterojunction control electrode cladding48US 4,093,345 ABell Telephone Laboratories, Incorporated · 1978
- Adjustable optical switch or modulator39US 4,012,113 A1977
- Wide free-spectral-range, widely tunable and hitless-switchable optical channel add-drop filters30US 8,032,027 B2Massachusetts Institute of Technology · 2011
- Electrooptically balanced alternating .DELTA..beta. switch28US 4,262,993 AThe United States of America as represented by the Secretary of the Navy · 1981
- Optical directional coupler device and a method of driving same24US 5,146,518 AFurukawa Electric Co., Ltd. · 1992