Dwa najlepsze (chyba) linki
http://patft.uspto.gov/netahtml/search-bool.html
http://ep.espacenet.com/search97cgi/s97 ... /quick.hts
powodzenia
proscan
PS
na mojej stronie masz liste producentow (staram sie by byla ona w miarę kompletna). Niektorzy na swoich stronach maja jakies informacje o zasadzie dzialania, ale w patentach znajdziesz szczegoly.
PPS
a tutaj wyniki wyszukiwania dla bramek:
jak znajdzisz trop, to po sznurku dotrzesz do innych (byc moze nawet bardziej ciekawych).
PAT. NO. Title
1 6,611,195 Identifying process and an automatically operated booth equipped with interblocking doors
2 6,610,977 Security system for NBC-safe building
3 6,541,966 Precision metal locating apparatus
4 6,484,650 Automated security chambers for queues
5 6,469,624 Non-obtrusive weapon detection system
6 6,366,203 Walk-through security device having personal effects view port and methods of operating and manufacturing the same
7 6,362,739 Passive security device for detecting ferromagnetic objects
8 6,222,450 Metal detection device having improved support assembly
9 6,133,829 Walk-through metal detector system and method
10 6,073,499 Chemical trace detection portal based on the natural airflow and heat transfer of the human body
11 5,821,855 Recognition responsive security system
12 5,741,984 Method and apparatus for sample collection by a token
13 5,692,029 Detection of concealed explosives and contraband
14 5,680,103 Metal detection system
15 5,672,807 Pendulum detector testing device
16 5,659,247 Device for detecting metal objects passing through an opening
17 5,600,303 Detection of concealed explosives and contraband
18 5,521,583 Metal detection system
19 5,039,981 Electromagnetic security detectors
20 4,906,973 Walk-through metal detector
21 4,866,424 Metal detector coil
22 4,821,023 Walk-through metal detector
23 D297,221 Walk-through metal detector
24 4,672,837 Test system for walk-through metal detector
25 4,357,535 Apparatus for inspecting hand-held articles and persons carrying same
26 4,068,164 Harmoic flux gate magnetometers and gradimeters and windings
27 4,012,690 Device for selectively detecting different kinds and sizes of metals
28 3,971,983 Ferromagnetic metal detector utilizing gradiometers positioned on opposite sides of the detection area with overlapping sensitivity
29 3,950,696 Trapezoidal coil configuration for metal detector in the shape of an inverted U