Patent assignee · US · COMPANY

OPTI CO., LTD.

44Patents
2Active
44Granted
37Portfolio score

Filing activity: Jan 25, 1974 → May 29, 2014 · 1 expiring within 5 years

Most-cited patents

PatentTitleAreaCited byStatus
US5790831A VL-bus/PCI-bus bridge Physics 116 Expired
US5371880A Bus synchronization apparatus and method Physics 107 Expired
US5469555A Adaptive write-back method and apparatus wherein the cache system operates in a combination of write-back and write-through modes for a cache-based microprocessor system Physics 101 Expired
US5710906A Predictive snooping of cache memory for master-initiated accesses Physics 92 Expired
US5287481A Automatic cache flush with readable and writable cache tag memory Physics 89 Expired
US5550515A Multiphase clock synthesizer having a plurality of phase shifted inputs to a plurality of phase comparators in a phase locked loop Electricity 70 Expired
US5426739A Local bus - I/O Bus Computer Architecture Physics 60 Expired
US5423019A Automatic cache flush with readable and writable cache tag memory Physics 50 Expired
US5933611A Dynamic scheduler for time multiplexed serial bus Physics 43 Expired
US5805905A Method and apparatus for arbitrating requests at two or more levels of priority using a single request line Emerging Cross-Sectional Technologies 40 Expired
US5854638A Unified memory architecture with parallel access by host and video controller Physics 38 Expired
US3962007A Method of making slide-fastener stringers Emerging Cross-Sectional Technologies 33 Expired
US6567875B1 USB data serializer Physics 32 Expired
US5309568A Local bus design Physics 32 Expired
US5918072A System for controlling variable length PCI burst data using a dummy final data phase and adjusting the burst length during transaction Physics 28 Expired
US5414827A Automatic cache flush Physics 27 Expired
US5907857A Refresh-ahead and burst refresh preemption technique for managing DRAM in computer system Physics 23 Expired
US5768624A Method and apparatus for employing ping-pong buffering with one level deep buffers for fast DRAM access Physics 22 Expired
US5463759A Adaptive write-back method and apparatus wherein the cache system operates in a combination of write-back and write-through modes for a cache-based microprocessor system Physics 21 Expired
US5448742A Method and apparatus for local memory and system bus refreshing with single-port memory controller and rotating arbitration priority Physics 20 Expired
US5813036A Predictive snooping of cache memory for master-initiated accesses Physics 19 Expired
US5900016A System for using a cache memory with a write-back architecture Physics 17 Expired
US5822768A Dual ported memory for a unified memory architecture Physics 16 Expired
US5881271A System and method for clock management Physics 14 Expired
US5577214A Programmable hold delay Physics 14 Expired

Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.