AMERICAN TELEPHONE AND TELEGRAPH COMPANY

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
H04M TELEPHONIC COMMUNICATION 17347
 
  
 
G02B OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS 14483
 
  
 
H01L SEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR 122242
 
  
 
H04L TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION 76209
 
  
 
H01S DEVICES USING STIMULATED EMISSION7435
 
  
 
H04J MULTIPLEX COMMUNICATION 6268
 
  
 
H04B TRANSMISSION 54156
 
  
 
G06F ELECTRIC DIGITAL DATA PROCESSING 43404
 
  
 
H04N PICTORIAL COMMUNICATION, e.g. TELEVISION 37205
 
  
 
H04Q SELECTING 3377

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
6638894 Devices and systems based on novel superconducting materialMar 10, 87Oct 28, 03[C04B, H01B]
6635603 Devices and systems based on novel superconducting materialMar 03, 87Oct 21, 03[C04B, H01B]
6630425 Devices and systems based on novel superconducting materialMar 18, 87Oct 07, 03[C04B, H01B]
6434121 Telephone agent call management systemAug 21, 91Aug 13, 02[H04J]
6359971 User display in speech recognition systemAug 21, 95Mar 19, 02[H04M]
6194240 Method for fabrication of wavelength selective electro-optic grating for DFB/DBR lasersDec 21, 93Feb 27, 01[H01L]
6159665 Processes using photosensitive materials including a nitro benzyl ester photoacid generatorJun 17, 93Dec 12, 00[G03C]
6086706 Document copying deterrent methodDec 20, 93Jul 11, 00[B32B]
5964397 Passive alignment of components with micromachined toolSep 11, 97Oct 12, 99[B23K]
5959342 Semiconductor device having a high voltage termination improvementDec 08, 93Sep 28, 99[H01L]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6580913 Method and apparatus for dynamic channel allocation for wireless communication using channel occupancy dataExpiredOct 16, 00Jun 17, 03[H04Q]
6330023 Video signal processing systems and methods utilizing automated speech analysisExpiredMar 18, 94Dec 11, 01[H04N]
6111133 Process for preparing substituted styrenesExpiredSep 23, 92Aug 29, 00[C07C]
5918184 Method and apparatus for detecting a supervisory audio toneExpiredMay 20, 94Jun 29, 99[H04Q]
5761291 Method of assigning telephone area codesExpiredJun 22, 94Jun 02, 98[H04M]
5640319 Switch control methods and apparatusExpiredMar 18, 91Jun 17, 97[H04M, G05B]
5623429 Techniques for expeditiously predicting electromagnetic wave propagationExpiredApr 06, 94Apr 22, 97[G06T]
5606597 User programmable configuration of a telephoneExpiredApr 25, 94Feb 25, 97[H04Q]
5606604 System and method for preventing fraud upon PBX through a remote maintenance or administration portExpiredDec 13, 93Feb 25, 97[H04M]
5590323 Optimal parallel processor architecture for real time multitaskingExpiredMay 13, 94Dec 31, 96[G06F]
5577147 Magnetically locatable optical fiber cables containing integrated magnetic marker materialsExpiredMar 31, 94Nov 19, 96[G02B]
5572350 Method and apparatus to compensate for differential attenuation in an optical time slot interchangerExpiredMar 31, 94Nov 05, 96[H04J]
5572618 Optical attenuatorExpiredJul 13, 94Nov 05, 96[G02B]
5559440 Method and apparatus for testing telecommunications equipment having both analog and digital interfacesExpiredDec 22, 94Sep 24, 96[G01R]
5559888 Secure information retrieval service (SIRS)ExpiredFeb 15, 94Sep 24, 96[H04L]
5549977 Article comprising magnetoresistive materialExpiredApr 15, 94Aug 27, 96[C23C, B05D, G11B]
5550903 Method for monitoring telephone completion dataExpiredDec 08, 93Aug 27, 96[H04M]
5539757 Error correction systems with modified Viterbi decodingExpiredDec 22, 93Jul 23, 96[H03M, G06F]
5533264 Apparatus for stripping cableExpiredJul 28, 94Jul 09, 96[B26B]
5530638 Multi-resonant electronic power converter with a wide dynamic rangeExpiredSep 24, 93Jun 25, 96[H02M]

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