Quotables
"Fooling around with alternating current is just a waste of time. Nobody will use it, ever."
Thomas Edison ; 1889
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 4684930 | Method and apparatus for deactivating targets used in electromagnetic type article surveillance systems A deactivator for deactivating targets used in electromagnetic article surveillance systems comprises a solid element with a convexly curved outer surface, e.g., a cylinder and a plurality of permanent magnets which form a patter of variously directed mag... | 08/04/1987 |
| 4665387 | Method and apparatus for target deactivation and reactivation in article surveillance systems Targets (14) mounted on objects (12) for detection by a magnetic type theft detection system are deactivated in a target deactivator (26,64) which has magnet assembly (40,72) made up of spaced apart magnets with alternately opposed poles extending in a pl... | 05/12/1987 |
| 4642613 | Electronic theft detection apparatus with responder elements on protected articles A self contained electronic theft detection apparatus comprising a housing (30) from which a rigid tubular transmitter antenna loop (32) extends; and a wire loop receiver antenna (56) extends inside the transmitter antenna loop. The transmitter antenna (3... | 02/10/1987 |
| 4623877 | Method and apparatus for detection of targets in an interrogation zone Targets (30) of readily saturable mangetic material and mounted on protected articles (14) are detected when taken through an interrogation zone (24) in which an alternating magnetic interrogation field is generated by transmitter antenna coils (42, 44). ... | 11/18/1986 |
| 4590461 | Tamper resistant target wafer and fastener assembly A tamper-resistant target wafer (10) for use in an electronic theft detection system has a housing formed with bulges (16 and 22) aligned with each other on opposite sides and which slope continuously downward toward the plane of the target wafer to minim... | 05/20/1986 |
| 4568921 | Theft detection apparatus and target and method of making same Items of merchandise (30) are protected from shoplifting or theft by affixing to them, special responder targets (32), which are formed by drawing a material of high magnetic permeability into a thin wire, then heat treating the wire to substantially incr... | 02/04/1986 |
| 4531264 | Theft detection system target fastener A fastening assembly for fastening a wafer (10) to an article of merchandise (12) and comprising a locking mechanism in a housing (14) and a fastener element (16) having an expansive head (18) and a shank (20), formed with axially spaced circumferential g... | 07/30/1985 |
| 4476459 | Theft detection method and apparatus in which the decay of a resonant circuit is detected In an electronic theft detection apparatus the passage of a resonant circuit wafer 16 through an interrogation zone formed by transmitter and receiving antennas (30, 90) (32, 92) is detected by generating sharp pulses of electromagnetic energy to cause th... | 10/09/1984 |
| 4384281 | Theft detection apparatus using saturable magnetic targets An electronic theft detection apparatus for detection of saturable magnetic targets has transmitter and receiver antennas formed of single turn loops of rigid metal pipe. The antennas are rectangular and have a width, in the direction of passage, through ... | 05/17/1983 |
| 4326198 | Method and apparatus for the promotion of selected harmonic response signals in an article detection system An electromagnetic article detection system of the type wherein a saturable magnetic target generates harmonics of an alternating magnetic interrogation field. A magnetic bias means is provided along with the magnetic interrogation field to promote the pr... | 04/20/1982 |
| 4321586 | Article theft detection An electronic article theft detection system accurately senses the presence of a target on a protected article by sensing electromagnetic disturbances at a plurality of frequences, comparing their relative amplitudes and producing a detection signal when ... | 03/23/1982 |
| 4299040 | Fastening means A fastening means for fastening a wafer to an article of merchandise and comprising a tack-like element whose shank passes through the merchandise and the wafer and a button-like fastening element which securely holds the shank of the tack-like element. T... | 11/10/1981 |
| 4274090 | Detection of articles in adjacent passageways An article theft detection system for identifying which of two adjacent passageways a protected article passes. Each passageway is provided with spaced apart interrogation and receiver antennas, but a single receiver antenna services both passageways. Mul... | 06/16/1981 |
| 4187509 | Wafer and fastener for use in electronic theft detection system A wafer construction which includes an expansive, generally flat plastic member formed with a spiral groove in which an elongated electrical conductor is held in the shape of a coil. The plastic member is also formed with a recess in which a capacitor is ... | 02/05/1980 |
| 4135184 | Electronic theft detection system for monitoring wide passageways An electronic theft detection system has a transmitting antenna and a receiving antenna located on the floor and overhead of a passageway being monitored. The antennas have conductors extending along and crossways of the passageway in staggered arrangemen... | 01/16/1979 |
| 4118693 | Method and apparatus for producing uniform electromagnetic fields in an article detection system An electromagnetic article detection system of the type wherein a target having frequency selective electrical characteristics produces predetermined electromagnetic effects in response to an alternating electromagnetic field. A large resonant electric ci... | 10/03/1978 |
| 4074249 | Magnetic detection means Magnetic detection means for protection of articles such as books, records and the like, wherein a target, of magnetically soft or easily saturable magnetic material, such as permalloy foil, is mounted on the protected article and emits magnetic signals w... | 02/14/1978 |
| 4016553 | Article detection system with near field electromagnetic wave control An electronic theft detection system includes antenna clusters connected to electromagnetic wave transmitter and receiver means. Each antenna cluster comprises a group of spaced apart parallel loops connected in phase opposition or bucking relationship. E... | 04/05/1977 |
