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 |
| 4358798 | Special effects system A speed control signal for a record segment is generated from starting speed and starting time information signals, an ending speed information signal, and a signal indicative of the duration of the segment. Provision is made for "pre-roll" (stopping the ... | 11/09/1982 |
| 4345278 | Acceleration correction for self-clocking write-head A time base signal for controlling the recording of binary data is developed by measuring the velocity of a magnetic record. The velocity is measured by determining an average velocity by the time interval required for a mark recorded by a write head to m... | 08/17/1982 |
| 4322747 | Rapid synchronization of information on separate recorded mediums Separate durations of acceleration and constant velocity are utilized to attain phase locking between a recorded sync signal and an external reference sync signal while accelerating a recorded medium from an intermediate velocity to its operational veloci... | 03/30/1982 |
| 4318140 | Video tape reproducing apparatus with various tape speeds In a video tape recorder, a video tape is advanced, at variable speeds other than the normal speed in order to search tape position for editing purpose, by observing the reproduced image on a monitor screen. A speed command signal is supplied to the video... | 03/02/1982 |
| 4308560 | Method of operating a signal reproducing apparatus for effecting synchronous reproduction of recorded signals A method of operating a signal recording and reproducing apparatus is disclosed whereby generally continuously and noise-free transfers of signal information are obtained while reproducing the information from a magnetic tape being transported at a changi... | 12/29/1981 |
| 4296446 | Motor speed control circuit A motor speed control circuit features a speed synthesizer for accurate speed control. The synthesizer has a phase-locked loop with a programmable divider for allowing variable speeds.... | 10/20/1981 |
| 4295170 | Variable tape speed for video recorders A speed control for varying the video tape speed which is adapted for use with the video tape recorder having a power supply providing a power signal and a capstan motor for driving the video tape in forward and reverse directions. The speed control inclu... | 10/13/1981 |
| 4267564 | Apparatus for controlling and stopping a transport mechanism at a predetermined cue point Apparatus is disclosed for issuing commands for controlling the operation of a transport mechanism preferably of the type which transports a recording medium such as a magnetic tape for the purpose of stopping at a predetermined cue point location on the ... | 05/12/1981 |
| 4261020 | Continuous speed control system for video tape recorder A control system is provided which is capable of controlling the speed of a video tape recorder in a continuously variable manner, even though the video tape recorder is designed to operate at discrete speeds. The variable speed control is achieved withou... | 04/07/1981 |
| 4224645 | Method and apparatus for controlling the movement of a recording medium A recording medium transport control precisely controls the movement of a recording medium such as magnetic tape at a desired velocity. A pulse drive control adapted for manipulation provides drive pulses to the transport. Each drive pulse is of a variabl... | 09/23/1980 |
| 4190790 | Isolator circuit for use with frequency sensitive switching circuit An isolator circuit for use with a switching circuit for energizing a ballasted load in response to a control signal of preselected frequency superimposed on AC power circuits which supply the load. In the switching circuit, a triac is gated to conduct th... | 02/26/1980 |
| 4163993 | Continuous slow motion automatic tracking system A method and apparatus is disclosed for automatically maintaining a transducing head on the proper track and is particularly adapted for a helical scan recording and reproducing apparatus that is capable of providing special motion effects, such as slow, ... | 08/07/1979 |
| 4160195 | Tape control apparatus Apparatus for controlling the speed, direction and tension of tape transported between a supply reel and a take-up reel. First and second drive motors are coupled to the supply and take-up reels for applying oppositely directed torques thereto, thereby bi... | 07/03/1979 |
| 4156257 | Motor control circuit for tape drive unit A tape drive for moving a tape with a prerecorded clock track past a transducer at a constant velocity. An output signal from a speed servo circuit controls the energization, and hence the speed, of a tape driving motor. It responds to a tape speed signal... | 05/22/1979 |
| 4107744 | Variable ratio magnetic tape drive using a variable belt thickness A variable ratio drive employs an elastic extensible control belt which changes its cross-section in relation to induced changes in its length, according to Poisson's ratio. The control belt is introduced between a pulley and a drive belt, and a mechanism... | 08/15/1978 |
| 4048651 | Color-corrected video signal processing with augmented color lock There is disclosed the combination of an information medium having physical characteristics representative of synchronized color video information, an electric power supply providing alternating current power subject to frequency fluctuations, transport e... | 09/13/1977 |
| 4037260 | Tape timer error corrector circuit for tape recorder/reproducers An error corrector circuit for correcting a tape timer in a video tape recorder/reproducer (VTR) having a multiple frequency control track, wherein a selected control track frequency is separated from the composite frequencies via commutating filter means... | 07/19/1977 |
