Patent Explorer
Browse, filter, and analyze 243 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| US4729533A | Support apparatus | International Business Machines Corp | Expired / Lapsed | 1987-03-27 | 1988-03-08 | 2007-03-27 | 0.0 yrs | 48 | |
| US4371932A | I/O Controller for transferring data between a host processor and multiple I/O units | International Business Machines Corp | Expired / Lapsed | 1981-11-25 | 1983-02-01 | 2001-11-25 | 0.0 yrs | 14 | |
| US4314244A | Multiple height proportioned character generation | International Business Machines Corp | Expired / Lapsed | 1980-06-16 | 1982-02-02 | 2000-06-16 | 0.0 yrs | 12 | |
| US4313161A | Shared storage for multiple processor systems | International Business Machines Corp | Expired / Lapsed | 1979-11-13 | 1982-01-26 | 1999-11-13 | 0.0 yrs | 15 | |
| US4186438A | Interactive enquiry system | International Business Machines Corp | Expired / Lapsed | 1977-03-16 | 1980-01-29 | 1997-03-16 | 0.0 yrs | 13 | |
| US4164668A | Method of correcting the voltage coefficient of resistors implanted or diffused in a semiconductor substrate | International Business Machines Corp | Expired / Lapsed | 1977-05-12 | 1979-08-14 | 1997-05-12 | 0.0 yrs | 8 | |
| US4155117A | Synchronizing channel-to-channel adapter | International Business Machines Corp | Expired / Lapsed | 1977-07-28 | 1979-05-15 | 1997-07-28 | 0.0 yrs | 14 | |
| US4144563A | Microprocessor system | International Business Machines Corp | Expired / Lapsed | 1977-11-21 | 1979-03-13 | 1997-11-21 | 0.0 yrs | 12 | |
| US4142234A | Bias filter memory for filtering out unnecessary interrogations of cache directories in a multiprocessor system | International Business Machines Corp | Expired / Lapsed | 1977-11-28 | 1979-02-27 | 1997-11-28 | 0.0 yrs | 23 | |
| US4136386A | Backing store access coordination in a multi-processor system | International Business Machines Corp | Expired / Lapsed | 1977-10-06 | 1979-01-23 | 1997-10-06 | 0.0 yrs | 15 | |
| US4129853A | Method and apparatus for producing compensated signals for individual light sensors arranged in a predetermined relation | International Business Machines Corp | Expired / Lapsed | 1977-09-26 | 1978-12-12 | 1997-09-26 | 0.0 yrs | 25 | |
| USD250022S | Keyboard enclosure for data processing equipment | International Business Machines Corp | Expired / Lapsed | 1977-04-07 | 1978-10-24 | 1997-04-07 | 0.0 yrs | 1 | |
| US4044244A | Automatic tester for complex semiconductor components including combinations of logic, memory and analog devices and processes of testing thereof | International Business Machines Corp | Expired / Lapsed | 1976-08-06 | 1977-08-23 | 1996-08-06 | 0.0 yrs | 17 | |
| US4041461A | Signal analyzer system | International Business Machines Corp | Expired / Lapsed | 1975-07-25 | 1977-08-09 | 1995-07-25 | 0.0 yrs | 43 | |
| US4020460A | Method and apparatus of checking to determine if a signal is present on more than one of n lines | International Business Machines Corp | Expired / Lapsed | 1975-11-13 | 1977-04-26 | 1995-11-13 | 0.0 yrs | 6 | |
| US4014005A | Configuration and control unit for a heterogeneous multi-system | International Business Machines Corp | Expired / Lapsed | 1976-01-05 | 1977-03-22 | 1996-01-05 | 0.0 yrs | 9 | |
| US4008460A | Circuit for implementing a modified LRU replacement algorithm for a cache | International Business Machines Corp | Expired / Lapsed | 1975-12-24 | 1977-02-15 | 1995-12-24 | 0.0 yrs | 18 | |
| US4007450A | Data sharing computer network | International Business Machines Corp | Expired / Lapsed | 1975-06-30 | 1977-02-08 | 1995-06-30 | 0.0 yrs | 16 | |
| US3961139A | Time division multiplexed loop communication system with dynamic allocation of channels | International Business Machines Corp | Expired / Lapsed | 1975-05-14 | 1976-06-01 | 1995-05-14 | 0.0 yrs | 20 | |
| US3928830A | Diagnostic system for field replaceable units | International Business Machines Corp | Expired / Lapsed | 1974-09-19 | 1975-12-23 | 1994-09-19 | 0.0 yrs | 9 |
Showing 1 to 20 of 243 patents
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