Rolm Systems
24Patents
0Active
24Granted
35Portfolio score
Filing activity: Apr 10, 1990 → Apr 20, 1995
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5581608A | Method and apparatus for masking the reporting of network telephony events to a computer | Electricity | 232 | Expired |
| US5175769A | Method for time-scale modification of signals | Physics | 142 | Expired |
| US5003573A | Self-diagnosis of loop start and ground start trunk interfaces | Electricity | 90 | Expired |
| US5181239A | Call tagging user information in a telephonic environment | Electricity | 67 | Expired |
| US5220596A | Method and apparatus for propagating a network profile | Electricity | 64 | Expired |
| US5155729A | Fault recovery in systems utilizing redundant processor arrangements | Physics | 64 | Expired |
| US5495528A | Digital telephone control interface system | Emerging Cross-Sectional Technologies | 43 | Expired |
| US5479501A | Far-end disconnect detector for telephony systems | Electricity | 30 | Expired |
| US5581757A | Partially replicated database for a network of store-and-forward message systems | Electricity | 27 | Expired |
| US5121420A | Automatic line defect detector | Electricity | 23 | Expired |
| US5172406A | DTMF signal detection apparatus | Electricity | 21 | Expired |
| US5136637A | Method and apparatus for automatic redialing of telephone numbers | Electricity | 21 | Expired |
| US5150368A | Minimization of modem retransmissions | Electricity | 21 | Expired |
| US5175761A | Call transfers by voice messaging system (VMS) integrated to a private branch exchange | Electricity | 19 | Expired |
| US5581251A | High visibility lightpipe in close proximity to function key | Electricity | 15 | Expired |
| US5388151A | Technique for reducing message notification blockage in voice mail systems | Electricity | 13 | Expired |
| US5202964A | Interface controller including messaging scanner accessing state action table | Physics | 12 | Expired |
| USD320392S | Telephone set | General | 8 | Expired |
| US5121696A | Packing pallet | Performing Operations; Transporting | 7 | Expired |
| US5113186A | Apparatus for converting an alternate mark inversion signal to unipolar signals with frequency dependent amplification | Electricity | 5 | Expired |
| US5144287A | Current level sensing circuit for use with gyrator circuitry | Physics | 5 | Expired |
| US5178600A | Tuck folder box erection fixture | Performing Operations; Transporting | 5 | Expired |
| US5414768A | Apparatus for electrically and mechanically connecting an auxiliary device to a main unit | Electricity | 3 | Expired |
| US5097143A | Bipolar to unipolar converter with automatic gain control | Electricity | 2 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.