Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 4908556 | Modular robot control system A modular digital robot control includes an electronic arm interface board provided with circuitry for performing robot arm dependent functions. Included are circuitry for generating power amplifier control signals in response to input voltage command sig... | 03/13/1990 |
| 4868472 | Communication interface for multi-microprocessor servo control in a multi-axis robot control system A servo control operates in a control loop for a robot control system and performs control support tasks and calculation tasks for the control loop for all of the robot joint motors. The servo includes first and second microprocessors. The first microproc... | 09/19/1989 |
| 4829219 | Multiaxis robot having improved motion control through variable acceleration/deceleration profiling A digital robot control employs planning and trajectory programs which generate the trajectory plan and trajectory position commands with the use of an acceleration profile and a deceleration profile selected from at least square wave and sine wave profil... | 05/09/1989 |
| 4807153 | Multiaxis digital robot control having a backup velocity monitor and protection system A digital robot control includes a position/velocity microprocessor control and a torque microprocessor control for each of multiple robot axes. Digital position, velocity and motor current feedback signals are generated from motor sensor signals for use ... | 02/21/1989 |
| 4786847 | Digital control for multiaxis robots A completely digital robot control operates at a predetermined sampling rate. The robot arm has a plurality of joints with each driven by an electric brushless or brush-type DC motor which is in turn supplied with drive current by a power amplifier bridge... | 11/22/1988 |
| 4734572 | Dual light source locating and tracking system Dual light beams directed onto adjacent surface elements defining a seam therebetween produce reflected light images which contact an electro-optic linear array sensor which in turn generates light spot position information for determining seam location v... | 03/29/1988 |
| 4688983 | Low cost robot An industrial robot in which both a column which is pivotally mounted on a rotatable base member and a boom which is pivotally mounted on the upper end of the column are of hollow construction to provide a rigid lightweight structure capable of carrying s... | 08/25/1987 |
| 4215337 | Dual-disc shaft position encoder The disclosed forms of shaft-position encoder employ "fast" and "slow" rotary selectors coupled by gearing to each other and to the shaft whose position is to be encoded. The selectors cooperate selectively with elements in respective "fast" and "slow" ci... | 07/29/1980 |
