Michael Callahan
48Patents
16h-index
17Co-inventors
78Inventor score
Filing activity: Nov 19, 1982 → Mar 21, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4947302A | Improvements to control systems for variable parameter lighting fixtures | Electricity | 175 | Expired |
| US6469457B2 | Power and data distribution in lighting systems | Emerging Cross-Sectional Technologies | 115 | Expired |
| US4974286A | Universal handle for hand-held implement | Emerging Cross-Sectional Technologies | 98 | Expired |
| US6211627A | Lighting systems | Emerging Cross-Sectional Technologies | 77 | Expired |
| US6976915B2 | Gaming device display with simulated halftones | Physics | 67 | Expired |
| US4697227A | Control system for variable parameter fixtures | Mechanical Engineering; Lighting; Heating | 57 | Expired |
| US4894760A | Additive color-mixing light fixture employing a single moveable multi-filter array | Mechanical Engineering; Lighting; Heating | 53 | Expired |
| USRE37190E | Universal handle for hand-held implement | General | 52 | Expired |
| US4527198A | Followspot parameter feedback | Mechanical Engineering; Lighting; Heating | 46 | Expired |
| US4797795A | Control system for variable parameter lighting fixtures | Mechanical Engineering; Lighting; Heating | 32 | Expired |
| US6237193A | Compressible handle | Performing Operations; Transporting | 28 | Expired |
| US4460943A | Azimuth and elevation control system | Emerging Cross-Sectional Technologies | 24 | Expired |
| US4600976A | Color changer mechanism | Mechanical Engineering; Lighting; Heating | 20 | Expired |
| US4769743A | Apparatus for mechanically adjusting lighting fixture azimuth and elevation | Mechanical Engineering; Lighting; Heating | 19 | Expired |
| US4931916A | Apparatus for mechanically adjusting lighting fixture beam azimuth and elevation | Mechanical Engineering; Lighting; Heating | 19 | Expired |
| US6962417B1 | Keystone correction system and method | Physics | 16 | Expired |
| USD426424S | Handle | General | 15 | Expired |
| USRE34194E | Universal handle for hand-held implement | General | 9 | Expired |
| US6125503A | Retracting rotational backpack blower air discharge tube unit | Human Necessities | 9 | Expired |
| US8898250B2 | Anonymous digital identification | Electricity | 5 | Active |
| US10614413B2 | Inventory management system and method of use | Physics | 4 | Active |
| US9989473B2 | Portable liquid analyzer | Physics | 3 | Active |
| US10214904B2 | Trusses and similar structures | Mechanical Engineering; Lighting; Heating | 3 | Active |
| US10330603B1 | Mass produced, low cost, portable test kit for the detection and identification of chemical and biological agents | Physics | 2 | Active |
| US10099387B2 | Apparatus, system and method for providing a vacuum ejector for an end effector | Performing Operations; Transporting | 2 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.