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 |
| 4475106 | High sensitivity portable radio direction finder A simple inexpensive, very effective high to ultra high frequency radio direction finder is disclosed utilizing two parallel antenna units with switching means for alternately connecting the antenna units to a conventional unmodified FM or NBFM receiver a... | 10/02/1984 |
| 4263597 | Nondisruptive ADF system An automatic radio direction finding (ADF) system having inputs for four quadrature antennas each having a cardioid pattern. Each input is amplitude modulated in quadrature and then combined in a hybrid circuit to produce a nondirectional pattern. The com... | 04/21/1981 |
| 4177467 | Waveguide receiving antenna An antenna for the short-range reception of an emitted signal comprises at least two independent sectors for the coarse location of an emission-beam source in two predetermined directions. Each sector is constituted by a waveguide having a single open fac... | 12/04/1979 |
| 3965473 | Direction finders A direction finder having an antenna system adapted to receive signals and provided with a right-hand and a left-hand lobe system. By coupling means said lobe systems can be made alternately operative. A comparison means is arranged for comparing received... | 06/22/1976 |
| 3936832 | System to process antenna beams to obtain the angular location of target with high resolution and accuracy The system comprises a set of 16 antennas disposed so that their beams ovap to cover completely some sector of area; a mixing system to provide a plurality of I.F. signals; a first detector for each I.F. signal which applies this signal to a comparison a... | 02/03/1976 |
