PhoneMate, Inc.
20Patents
0Active
20Granted
30Portfolio score
Filing activity: Feb 11, 1974 → Feb 23, 1995
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5400393A | Voice mail digital telephone answering device | Electricity | 132 | Expired |
| US5418839A | Environmental adaptive mechanism for channel utilization in cordless telephones | Emerging Cross-Sectional Technologies | 103 | Expired |
| US5406618A | Voice activated, handsfree telephone answering device | Electricity | 69 | Expired |
| US5197093A | Enviromental adaptive mechanism for channel utilization in cordless telephones | Electricity | 56 | Expired |
| US5313516A | Telephone answering device with automatic function | Electricity | 52 | Expired |
| US5432844A | Shared line answering system with enhanced extension device features | Electricity | 35 | Expired |
| USD356087S | Combined telephone, telephone handset and telephone answering device | General | 34 | Expired |
| US5432836A | Interchangeable base arrangement for wall mount/desk mount telephone answering device | Electricity | 29 | Expired |
| USD284368S | Telephone answering machine | General | 22 | Expired |
| USD316409S | Cordless handset telephone | General | 18 | Expired |
| US5289529A | Means for improving the dynamic range of an analog/digital converter in a digital telephone answering machine | Electricity | 11 | Expired |
| USD315730S | Cordless telephone answering set | General | 10 | Expired |
| USD316024S | All digital telephone answering device | General | 10 | Expired |
| US5111500A | Handset or speaker message retrieval system | Electricity | 9 | Expired |
| US4114834A | Tape drive system and one-way clutch mechanism | Physics | 8 | Expired |
| USD372717S | Telephone answering device base unit | General | 8 | Expired |
| US4198544A | Tape head control arrangement | Electricity | 7 | Expired |
| US5392332A | Shared line telephone answering system with a telephone line-powered disconnect module | Electricity | 5 | Expired |
| US3953679A | Telephone answering device utilizing Mobius loop activating switch | Electricity | 3 | Expired |
| USRE34968E | Handset or speaker message retrieval system | General | 2 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.