Martin Henderson

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Wayland, MA, US

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Patents Grantslast 30 patents

Information Patent Grant
Speakerphone and extension speakerphone for use in personal emergen...
- Patent number 8,515,022
- Issue date Aug 20, 2013
- Koninklijke Philips N.V.
- Anson William Wooding
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Reminder phone
- Patent number 6,504,908
- Issue date Jan 7, 2003
- Lifeline Systems, Inc.
- Michael Bellomo
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Non-home run zoning system
- Patent number 4,468,664
- Issue date Aug 28, 1984
- American District Telegraph Company
- Aaron A. Galvin
- G08 - SIGNALLING
Information Patent Grant
System for test sequence annunciation
- Patent number 4,412,211
- Issue date Oct 25, 1983
- American District Telegraph Co.
- William J. Lautzenheiser
- G08 - SIGNALLING

Patents Applicationslast 30 patents

Information Patent Application
SPEAKERPHONE AND EXTENSION SPEAKERPHONE FOR USE IN PERSONAL EMERGEN...
- Publication number 20110081005
- Publication date Apr 7, 2011
- Koninklijke Philips Electronics N.V.
- Anson William Wooding
- H04 - ELECTRIC COMMUNICATION TECHNIQUE