Robert E. Johnson

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Pembroke, MA, US

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Patents Grantslast 30 patents

Information Patent Grant
Housing for a portable gas analyzer
- Patent number D404324
- Issue date Jan 19, 1999
- The Foxboro Company
- Richard H. Seager
- D10 - Measuring, testing, or signalling instruments
Information Patent Grant
Optical spectral filter and linear positioner therefor
- Patent number 5,793,545
- Issue date Aug 11, 1998
- The Foxboro Company
- Stephen L. Monfre
- G02 - OPTICS
Information Patent Grant
Smoke detector
- Patent number 4,564,762
- Issue date Jan 14, 1986
- Pyrotector, Inc.
- Charles F. Doherty
- G08 - SIGNALLING
Information Patent Grant
Ionization type smoke detector with test circuit
- Patent number 4,456,907
- Issue date Jun 26, 1984
- Pyrotector, Inc.
- Robert E. Johnson
- G08 - SIGNALLING
Information Patent Grant
Smoke detector of the ionization type
- Patent number 4,455,553
- Issue date Jun 19, 1984
- Pyrotector, Inc.
- Robert E. Johnson
- G08 - SIGNALLING