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Expired patents of:
Northern Telecom Limited

Displaying 1 to 50 of 137 patents. (Retrieval took 2.332 seconds.)

 Patent TitleExpired:
1.Digital FSK demodulator with offset cancellation2007-02-28
2.Gain clamped amplifier2007-02-16
3.Quadrature signals frequency doubler2007-02-14
4.Flexible scheduling mechanism for ATM switches2007-02-14
5.Battery charger/rectifier voltage temperature compensation circuit including protection and diagnostic scheme2007-02-09
6.Shadow mask for backlit LCD2007-02-09
7.Environmental protection housing2007-02-02
8.ATM switch having location independent virtual-connection switches2007-02-02
9.Clock recovery2007-01-31
10.Connection admission control for ATM networks2007-01-19
11.Telecommunications apparatus and method2007-01-19
12.Adaptive routing in a multiple network communication system2007-01-19
13.Digital driver with class AB output stage2007-01-17
14.Directional coupler for differentially driven twisted line2006-12-27
15.Low noise oscillators and tracking filters2006-12-06
16.Optical fibre cable incorporating a stack of fibre ribbon elements2006-11-29
17.Telecommunications switch apparatus and method for time switching2006-11-24
18.Semiconductor optical waveguide2006-11-24
19.Method and apparatus for measuring the duty cycle of a digital signal2006-11-22
20.Creation of bragg reflactive gratings in waveguides2006-11-17
21.Method and system for controlling echo return loss using a complementary variolosses in transmit path2006-11-17
22.Telephone ringing signal generator2006-11-17
23.Backplane databus utilizing directional couplers2006-11-15
24.Injection laser and photosensor assembly2006-11-15
25.Power factor and crest factor circuit2006-11-10
26.Method of testcase optimization2006-11-03
27.Printed circuit board2006-11-01
28.General purpose liquid crystal display controller2006-10-27
29.Etalon arrangement2006-10-27
30.System and method for partitioning a cellular environment2006-10-27
31.Formation of ruthenium oxide for integrated circuits2006-10-25
32.Low radiation balanced microstrip bandpass filter2006-10-20
33.Multiple algorithm processing on a plurality of digital signal streams via context switching2006-10-20
34.Voltage-controlled oscillator2006-10-13
35.Writing diffraction gratings with interference fringe patterns2006-10-13
36.Affixing dielectric resonator on PCB2006-10-11
37.Method for forming interconnect structures for integrated circuits2006-10-11
38.Redundantly coded visual indication system2006-10-06
39.Electro-magnetic interference shield for a telephone handset2006-10-06
40.Quantifying circuit performance2006-10-06
41.Trench resistors for integrated circuits2006-10-04
42.Apparatus for use with analytical measuring instruments using electromagnetic radiation analysis methods2006-09-27
43.Apparatus and method for lossy compression using dynamic domain quantization2006-09-22
44.Testing of properties in flowable materials2006-09-15
45.Threshold setting device2006-09-08
46.Charge pump circuit with source-sink current steering2006-09-01
47.Adaptive sparse echo canceller using a sub-rate filter for active tap selection2006-08-30
48.Ball grid array (BGA) integrated circuit packages2006-08-18
49.Printed circuit board and heat sink arrangement2006-08-18
50.Circuit pack and environmental protection assembly2006-08-18

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