Crest Industries Corp.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
H04L TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION 2283

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5237611 Encryption/decryption apparatus with non-accessible table of keysJul 23, 92Aug 17, 93[H04L]
5222136 Encrypted communication systemJul 23, 92Jun 22, 93[H04L]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5301247 Method for ensuring secure communicationsExpiredJul 23, 92Apr 05, 94[H04K]
D293690 Desk caddyExpiredAug 22, 86Jan 12, 88[]
D292991 Desk caddyExpiredAug 22, 86Dec 01, 87[]
D274143 Telephone equipment female connector for mounting in apertured escutcheon plateExpiredMar 10, 82Jun 05, 84[]
D273293 Telephone face plateExpiredJun 04, 81Apr 03, 84[]
4323734 Interface circuit for telephone line to equipment signal couplingExpiredMay 15, 80Apr 06, 82[H04Q]
D258968 DirectoryExpiredMar 07, 79Apr 21, 81[D190]
D258969 DirectoryExpiredMar 07, 79Apr 21, 81[D190]
4228324 Key telephone system having interstation signalling during hold conditionExpiredMay 14, 79Oct 14, 80[H04M]
4218590 Key telephone system having automatic exclusion circuit for line privacyExpiredJan 29, 79Aug 19, 80[H04M]

Top Inventors for This Owner

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