David B. Smith
74Patents
19h-index
44Co-inventors
84Inventor score
Filing activity: Aug 18, 1975 → Jun 30, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6263055A | System for suppressed ringing access of subscriber lines to identify usage anomalies of customer premise equipment connected thereto | Electricity | 263 | Expired |
| US6452490B1 | Home/commercial security monitoring system | Emerging Cross-Sectional Technologies | 214 | Expired |
| US5559871A | Call charge control and notification | Electricity | 138 | Expired |
| US5999526A | Method and apparatus for delivering data from an information provider using the public switched network | Electricity | 101 | Expired |
| US6912177B2 | Transmission of data in boreholes | Physics | 84 | Expired |
| US4096856A | Portable electronic physiological instrument having separable first and second components, and improved mechanical connector therefor | Electricity | 74 | Expired |
| US6724885B1 | Automatic call distribution center with queue position restoration for call-back customers | Electricity | 63 | Expired |
| US5721765A | Personal identification number security system incorporating a time dimension | Electricity | 59 | Expired |
| US6167042A | Communications between service providers and customer premises equipment | Emerging Cross-Sectional Technologies | 55 | Expired |
| US5812656A | System for providing prioritized connections in a public switched network | Electricity | 51 | Expired |
| US5450123A | Method to enhance voice communications using encoded one-way video signals under bi-directional user or network control for transmitting stored or real-time video or image information | Electricity | 49 | Expired |
| US6615194B1 | System for secure execution of credit based point of sale purchases | Physics | 48 | Expired |
| US5825849A | Loop-back test system using a suppressed ringing connection | Electricity | 32 | Expired |
| US6563916B1 | System for transmitting a change in call queued/hold state across a communications network | Electricity | 26 | Expired |
| US6798877B2 | Enhanced end user automatic call distributor control | Electricity | 25 | Expired |
| US5742667A | Notification of toll free call charging status | Electricity | 24 | Expired |
| US7591418B2 | Stored-value card with housed object | Physics | 23 | Active |
| US6128376A | Change of equal access carrier notification | Electricity | 21 | Expired |
| US6219415A | Call hold state notification across a communications network | Electricity | 19 | Expired |
| USD244154S | Portable defibrillator | General | 17 | Expired |
| US6754311B1 | Enhanced subscriber line call monitoring | Electricity | 16 | Expired |
| US5606593A | Apparatus and method for automatically returning a telephone set to an on-hook condition | Electricity | 16 | Expired |
| USD249064S | Portable defibrillator/EKG monitor/EKG recorder | General | 16 | Expired |
| USD244155S | Portable electrocardiogram monitor and recorder | General | 16 | Expired |
| US5710807A | Method for recording non-communication intervals during a communications call | Electricity | 16 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.