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 |
| 5376844 | Programmable logic device with multiplexer-based programmable interconnections A programmable logic array integrated circuit has a plurality of programmable logic elements grouped into a plurality of mutually exclusive groups. Each group includes signal conductors uniquely associated with that group for conveying signals between the... | 12/27/1994 |
| 5371422 | Programmable logic device having multiplexers and demultiplexers randomly connected to global conductors for interconnections between logic elements A programmable logic device is provided that has a two-dimensional array of logic array blocks. The logic array blocks, which contain advanced macrocells, contain programmable input arrays based on pterm logic and are two-dimensionally interconnected with... | 12/06/1994 |
| 5369877 | Apparatus for winding armatures having slot commutators A wire winding machine is provided that allows the connection of electric motor armature coil leads to slot-type commutators. The machine uses rotations of a flyer and rotations of the armature to perform much of the needed movement during the lead attach... | 12/06/1994 |
| 5369314 | Programmable logic device with redundant circuitry A programmable logic device is provided that has redundant circuitry. When a portion of the programmable logic device circuitry is found to be defective, the redundant circuitry is switched into use in place of the defective circuitry by programming appro... | 11/29/1994 |
| 5350954 | Macrocell with flexible product term allocation An improved macrocell is provided for summing product term inputs to complete a sum of products. Some or all of a macrocell's product terms can be allocated to another macrocell. The macrocell OR function remains available to sum product term inputs, even... | 09/27/1994 |
| 5330204 | Non-impact keyless chuck A non-impact keyless chuck suitable for use with manual or powered drivers is disclosed. The chuck comprises a body which carries a rotatable split nut having a relatively fine thread and a plurality of slidable jaws, which may be identical, driven by the... | 07/19/1994 |
| 5310124 | Wire tensioner with program controlled bidirectional pulley wheel A wire tensioner maintains wire in a winding machine at a substantially constant tension during the process of winding coils for electrical components such as armatures. The tensioner has a pulley wheel that is driven by a bidirectional drive unit. During... | 05/10/1994 |
| 5285153 | Apparatus for facilitating scan testing of asynchronous logic circuitry Scan testing of asynchronous logic circuitry is facilitated by gating off the asynchronous inputs to flip-flops during scan testing. If desired, the asynchronous inputs which are gated off in this manner may themselves be tested by connecting them to one ... | 02/08/1994 |
| 5260915 | Wristwatch radiotelephone A combined wristwatch and radiotelephone has a plurality of substantially rigid segment members arranged end to end in a series with pivotable connections between each adjacent pair of members in the series. The pivotal axes of these connections are subst... | 11/09/1993 |
| 5260610 | Programmable logic element interconnections for programmable logic array integrated circuits A programmable logic array integrated circuit has a plurality of programmable logic elements grouped into a plurality of mutually exclusive groups. Each group includes signal conductors uniquely associated with that group for conveying signals between the... | 11/09/1993 |
| 5253879 | Non-impact keyless chuck A non-impact keyless chuck suitable for use with manual or powered drivers is disclosed. The chuck comprises a body which carries a rotatable split nut having a relatively fine thread and a plurality of slidable jaws, which may be identical, driven by the... | 10/19/1993 |
| 5251189 | Wristwatch radiotelephone A wristwatch radiotelephone having a plurality of substantially rigid members connected end to end in a series. The members are shaped and positioned to allow the members to be arranged in an arcuate array when the apparatus is to be worn on the wrist as ... | 10/05/1993 |
| 5239574 | Methods and apparatus for detecting voice information in telephone-type signals Voice signal information in a telephone-type signal is detected by subjecting the signal to several tests such as a minimum energy test, an amplitude ratio test, and a sequencing test which ensures that the other tests have been satisfied for a sufficient... | 08/24/1993 |
| 5215317 | Keyless chuck A chuck has a spring connection between the nut which rotates to advance or retract the jaws and the control ring or sleeve which the user rotates to operate the chuck. The spring normally transmits tightening or loosening rotation from the sleeve to the ... | 06/01/1993 |
| 5201290 | Compression relief engine retarder clip valve An improved clip valve for use in a compression release engine retarder is disclosed. The clip valve assembly incorporates an improved mechanism for arresting the downward motion of a clip valve plunger by using a retaining ring. The apparatus is more rob... | 04/13/1993 |
| 5166604 | Methods and apparatus for facilitating scan testing of asynchronous logic circuitry Scan testing of asynchronous logic circuitry is facilitated by gating off the asynchronous inputs to flip-flops during scan testing. If desired, the asynchronous inputs which are gated off in this manner may themselves terminals or scan registers during t... | 11/24/1992 |
| 5164989 | Echo cancellation methods and apparatus for voice processing systems In a voice processing system employing the telephone communications network, any echo of an outgoing signal is substantially eliminated from the incoming signal by appropriately combining an appropriate version of the outgoing signal with the incoming sig... | 11/17/1992 |
| 5161501 | Self-clippping slave piston An improved slave piston for use in a compression release engine retarder is disclosed. The piston incorporates a self-clipping mechanism whereby, when appropriate, the escape of the high-pressure fluid that drives the slave piston is allowed, clipping th... | 11/10/1992 |
