FI821956A0 - Dubbelfrekvent tjuvalarmsystem - Google Patents
Dubbelfrekvent tjuvalarmsystemInfo
- Publication number
- FI821956A0 FI821956A0 FI821956A FI821956A FI821956A0 FI 821956 A0 FI821956 A0 FI 821956A0 FI 821956 A FI821956 A FI 821956A FI 821956 A FI821956 A FI 821956A FI 821956 A0 FI821956 A0 FI 821956A0
- Authority
- FI
- Finland
- Prior art keywords
- tjuvalarmsystem
- double frequency
- double
- frequency
- frequency tjuvalarmsystem
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
- G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
- G08B13/2405—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
- G08B13/2422—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using acoustic or microwave tags
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
- G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
- G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
- G08B13/2468—Antenna in system and the related signal processing
- G08B13/2471—Antenna signal processing by receiver or emitter
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Computer Security & Cryptography (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Acoustics & Sound (AREA)
- Burglar Alarm Systems (AREA)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US19557280A | 1980-10-09 | 1980-10-09 | |
US19557280 | 1980-10-09 | ||
PCT/US1981/001335 WO1982001437A1 (en) | 1980-10-09 | 1981-10-01 | Dual frequency anti-theft system |
US8101335 | 1981-10-01 |
Publications (3)
Publication Number | Publication Date |
---|---|
FI821956A0 true FI821956A0 (fi) | 1982-06-02 |
FI73532B FI73532B (fi) | 1987-06-30 |
FI73532C FI73532C (fi) | 1987-10-09 |
Family
ID=22721923
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FI821956A FI73532C (fi) | 1980-10-09 | 1982-06-02 | Dubbelfrekvent stoeldbekaempningssystem. |
Country Status (12)
Country | Link |
---|---|
EP (1) | EP0062056A4 (fi) |
JP (1) | JPH0353678B2 (fi) |
AU (1) | AU552568B2 (fi) |
BR (1) | BR8108829A (fi) |
CA (1) | CA1190970A (fi) |
DK (1) | DK161172C (fi) |
ES (1) | ES506117A0 (fi) |
FI (1) | FI73532C (fi) |
IT (1) | IT1142881B (fi) |
NZ (1) | NZ198497A (fi) |
WO (1) | WO1982001437A1 (fi) |
ZA (1) | ZA816937B (fi) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0091581B1 (en) * | 1982-04-12 | 1988-05-18 | Ici Americas Inc. | Crossed beam high frequency anti-theft system |
CA1236542A (en) * | 1983-08-02 | 1988-05-10 | Harold B. Williams | Electronic article surveillance system having microstrip antennas |
US5349332A (en) * | 1992-10-13 | 1994-09-20 | Sensormatic Electronics Corportion | EAS system with requency hopping |
US5347280A (en) * | 1993-07-02 | 1994-09-13 | Texas Instruments Deutschland Gmbh | Frequency diversity transponder arrangement |
US5831530A (en) * | 1994-12-30 | 1998-11-03 | Lace Effect, Llc | Anti-theft vehicle system |
US5798693A (en) | 1995-06-07 | 1998-08-25 | Engellenner; Thomas J. | Electronic locating systems |
US8358209B2 (en) * | 2005-06-03 | 2013-01-22 | Sensomatic Electronics, LLC | Techniques for detecting RFID tags in electronic article surveillance systems using frequency mixing |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO126975B (fi) * | 1967-03-30 | 1973-04-16 | John Welsh | |
US3631484A (en) * | 1969-07-30 | 1971-12-28 | Microlab Fxr | Harmonic detection system |
US3707711A (en) * | 1970-04-02 | 1972-12-26 | Peter Harold Cole | Electronic surveillance system |
US3895368A (en) * | 1972-08-09 | 1975-07-15 | Sensormatic Electronics Corp | Surveillance system and method utilizing both electrostatic and electromagnetic fields |
GB1586069A (en) * | 1976-11-15 | 1981-03-18 | Nedap Nv | Detection systems |
NL7804417A (nl) * | 1977-04-28 | 1978-10-31 | Parmeko Ltd | Detectiestelsel voor het bewaken van de positie van een artikel in een controlezone. |
US4139844A (en) * | 1977-10-07 | 1979-02-13 | Sensormatic Electronics Corporation | Surveillance method and system with electromagnetic carrier and plural range limiting signals |
ZA7994B (en) * | 1978-01-11 | 1980-01-30 | Tag Radionics Ltd | Presence sensing system |
US4249167A (en) * | 1979-06-05 | 1981-02-03 | Magnavox Government And Industrial Electronics Company | Apparatus and method for theft detection system having different frequencies |
-
1981
- 1981-09-28 CA CA000386839A patent/CA1190970A/en not_active Expired
- 1981-09-29 NZ NZ198497A patent/NZ198497A/en unknown
- 1981-10-01 AU AU77219/81A patent/AU552568B2/en not_active Ceased
- 1981-10-01 BR BR8108829A patent/BR8108829A/pt unknown
- 1981-10-01 JP JP56503332A patent/JPH0353678B2/ja not_active Expired - Lifetime
- 1981-10-01 EP EP19810902853 patent/EP0062056A4/en not_active Ceased
- 1981-10-01 WO PCT/US1981/001335 patent/WO1982001437A1/en not_active Application Discontinuation
- 1981-10-07 ZA ZA816937A patent/ZA816937B/xx unknown
- 1981-10-08 IT IT49451/81A patent/IT1142881B/it active
- 1981-10-08 ES ES506117A patent/ES506117A0/es active Granted
-
1982
- 1982-06-02 FI FI821956A patent/FI73532C/fi not_active IP Right Cessation
- 1982-06-09 DK DK258082A patent/DK161172C/da not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ES8207351A1 (es) | 1982-09-01 |
NZ198497A (en) | 1985-08-30 |
DK161172C (da) | 1991-11-25 |
DK161172B (da) | 1991-06-03 |
EP0062056A1 (en) | 1982-10-13 |
DK258082A (da) | 1982-06-09 |
WO1982001437A1 (en) | 1982-04-29 |
IT8149451A0 (it) | 1981-10-08 |
IT1142881B (it) | 1986-10-15 |
BR8108829A (pt) | 1982-08-24 |
JPH0353678B2 (fi) | 1991-08-15 |
EP0062056A4 (en) | 1985-06-06 |
FI73532C (fi) | 1987-10-09 |
ZA816937B (en) | 1982-11-24 |
ES506117A0 (es) | 1982-09-01 |
FI73532B (fi) | 1987-06-30 |
CA1190970A (en) | 1985-07-23 |
AU7721981A (en) | 1982-05-11 |
AU552568B2 (en) | 1986-06-05 |
JPS57501550A (fi) | 1982-08-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MM | Patent lapsed |
Owner name: DETERRENT TECHNOLOGY CORPORATION |