AT&T CORP.
🏢 View company profile →4,265Patents
338Active
4,265Granted
51Portfolio score
Filing activity: Apr 13, 1984 → Nov 11, 2009 · 336 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6009410A | Method and system for presenting customized advertising to a user on the world wide web | Emerging Cross-Sectional Technologies | 1,345 | Expired |
| US6014090A | Method and apparatus for delivering local information to travelers | Electricity | 940 | Expired |
| US6047268A | Method and apparatus for billing for transactions conducted over the internet | Physics | 917 | Expired |
| US5708422A | Transaction authorization and alert system | Physics | 762 | Expired |
| US5914472A | Credit card spending authorization control system | Physics | 694 | Expired |
| US6452923B1 | Cable connected wan interconnectivity services for corporate telecommuters | Electricity | 693 | Expired |
| US5974398A | Method and apparatus enabling valuation of user access of advertising carried by interactive information and entertainment services | Physics | 686 | Expired |
| US5805587A | Call notification feature for a telephone line connected to the internet | Electricity | 666 | Expired |
| US5678041A | System and method for restricting user access rights on the internet based on rating information stored in a relational database | Emerging Cross-Sectional Technologies | 653 | Expired |
| US5479482A | Cellular terminal for providing public emergency call location information | Electricity | 644 | Expired |
| US5819284A | Personalized real time information display as a portion of a screen saver | Emerging Cross-Sectional Technologies | 626 | Expired |
| US5485510A | Secure credit/debit card authorization | Physics | 621 | Expired |
| US5388147A | Cellular telecommunication switching system for providing public emergency call location information | Physics | 601 | Expired |
| US6012090A | Client-side parallel requests for network services using group name association | Electricity | 584 | Expired |
| US6173279A | Method of using a natural language interface to retrieve information from one or more data resources | Emerging Cross-Sectional Technologies | 570 | Expired |
| US5592470A | Broadband wireless system and network architecture providing broadband/narrowband service with optimal static and dynamic bandwidth/channel allocation | Emerging Cross-Sectional Technologies | 555 | Expired |
| US6510152B1 | Coaxial cable/twisted pair fed, integrated residence gateway controlled, set-top box | Electricity | 533 | Expired |
| US6212548A | System and method for multiple asynchronous text chat conversations | Electricity | 501 | Expired |
| US5778182A | Usage management system | Electricity | 482 | Expired |
| US6366933B1 | Method and apparatus for tracking and viewing changes on the web | Physics | 480 | Expired |
| US5537470A | Method and apparatus for handling in-bound telemarketing calls | Electricity | 453 | Expired |
| US5544246A | Smartcard adapted for a plurality of service providers and for remote installation of same | Electricity | 447 | Expired |
| US5373550A | Transmission of check images by way of a public switched telephone network | Electricity | 442 | Expired |
| US6052594A | System and method for dynamically assigning channels for wireless packet communications | Electricity | 439 | Expired |
| US6173261A | Grammar fragment acquisition using syntactic and semantic clustering | Physics | 434 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.