Rolm Company
66Patents
0Active
66Granted
38Portfolio score
Filing activity: Apr 16, 1975 → Apr 2, 1996
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5276731A | Method and apparatus for handling incoming telephone calls | Electricity | 340 | Expired |
| US5561703A | System and method for integration of a paging server into a private branch exchange environment | Electricity | 195 | Expired |
| US5502761A | Apparatus and method for relaying calling information to a pager or alternate telephone | Electricity | 124 | Expired |
| US5287352A | Method and apparatus to reduce register overhead in a serial digital interface | Electricity | 115 | Expired |
| US4485470A | Data line interface for a time-division multiplexing (TDM) bus | Electricity | 106 | Expired |
| US5430730A | Method for building a sub-network in a distributed voice messaging system | Electricity | 103 | Expired |
| US4313036A | Distributed CBX system employing packet network | Emerging Cross-Sectional Technologies | 90 | Expired |
| US5268957A | "Automatic call-back ""camp-on"" service for communication systems" | Electricity | 81 | Expired |
| US4163124A | Finite storage-time queue | Electricity | 81 | Expired |
| US5287498A | Message transmitting system wherein recipient site is determined using information concerning the relationship between the sender and recipient sites | Electricity | 77 | Expired |
| US5452347A | Dual-line telephone bridging device that gives remote telephones access to communications features | Electricity | 71 | Expired |
| US4475235A | Signature verification sensor | Physics | 66 | Expired |
| US5274696A | Protocol for transmitting messages in a network | Electricity | 55 | Expired |
| US5349640A | Option bus adapter | Electricity | 51 | Expired |
| US5241586A | Voice and text annotation of a call log database | Electricity | 48 | Expired |
| US3999129A | Method and apparatus for error reduction in digital information transmission systems | Electricity | 42 | Expired |
| US5594781A | Mobile telephone connection transfer | Electricity | 41 | Expired |
| US5278897A | Smart internodal transfer for subscriber access in multinode voice messaging systems | Electricity | 31 | Expired |
| US5231375A | Apparatus and method for detecting theft of electronic equipment | Physics | 30 | Expired |
| US4187466A | Signal injection technique | Electricity | 30 | Expired |
| US5278976A | Method for detecting infinite loops by setting a flag indicating execution of an idle task having lower priority than executing application tasks | Physics | 30 | Expired |
| USD340059S | Interface to a telephone set | General | 29 | Expired |
| US4320520A | Transmitter/receiver for use on common cable communications system such as ethernet | Emerging Cross-Sectional Technologies | 27 | Expired |
| US5572698A | System and method for allocating memory resources where the category of a memory resource determines where on a circular stack a pointer to the memory resource is placed | Electricity | 23 | Expired |
| US5440616A | Method and apparatus for interconnecting a messaging system and a private branch exchange | Electricity | 23 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.