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 |
| 6474951 | Controller for pump and valve The invention relates to an apparatus including a pump 1 driven by an electronically controlled electric motor 3 with a pump controller 4 and a valve 2 operated by an electronically controlled drive 10 with a valve controller 11, the valve controller 11 b... | 11/05/2002 |
| 5971712 | Method for detecting the occurrence of surge in a centrifugal compressor A method for detecting the occurrence of surge in a centrifugal compressor includes the step of calculating a time rate of change of a discharge pressure of the fluid discharged from the compressor. In one preferred embodiment, the time rate of change of ... | 10/26/1999 |
| 4708594 | Method of starting a variable-speed pump turbine or a variable speed pump A method of starting a variable-speed pump turbine or a variable-speed pump driven by a variable-speed generator motor or a variable-speed motor connected to an electric power line in parallel therewith. The generator motor or the motor is first operated ... | 11/24/1987 |
| 4102604 | Method and apparatus for noninteracting control of a dynamic compressor having rotating vanes A control system is disclosed for a noninteracting control and protection of a dynamic compressor having rotating vanes. The method consists of a junction of a few control circuits for controlling the performance of a dynamic compressor, for protecting compres... | 07/25/1978 |
| 3994623 | Method and apparatus for controlling a dynamic compressor A method is disclosed for a cascade control of a dynamic compressor to maintain a constant mass flow rate to a process. The method consists of a successive junction of control loops for controlling the speed of rotation, the pressure in the delivery, and ... | 11/30/1976 |
| 3981618 | Method and apparatus for preventing pump cavitation The speed of an engine driven pump is sensed and compared with the desired maximum operating speed to detect overspeed. The discharge of the pump is controlled by a variable flow rate controller. When an overspeed condition exists, a command signal is sen... | 09/21/1976 |
