New England Power Service Company

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4559520 Method for communication utilizing multi-mode receptionExpiredJun 23, 82Dec 17, 85[H04B]
4473535 Process for reducing nitric oxidesExpiredOct 16, 81Sep 25, 84[C01B, B01J]
4400688 Method and apparatus for communication over electric power linesExpiredOct 15, 80Aug 23, 83[H04B]
4246234 Method and apparatus for reducing nitric oxideExpiredMay 26, 78Jan 20, 81[F01N, B01J, B01D]
4218655 Method and apparatus for transmitting intelligence over a carrier waveExpiredDec 14, 77Aug 19, 80[H03K]
4201552 Coal-oil slurry compositionsExpiredJul 20, 78May 06, 80[C10L]

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