EP 0026383 A1 19810408 - Alarm system for the protection of glass surfaces, especially show-window panes.
Title (en)
Alarm system for the protection of glass surfaces, especially show-window panes.
Title (de)
Alarmsystem für den Schutz von Glasflächen, insbesondere Schaufensterscheiben.
Title (fr)
Système d'alarme pour la protection de surfaces vitrées, en particulier des vitres d'étalage.
Publication
Application
Priority
DE 2938968 A 19790926
Abstract (en)
Alarm system with ultrasound which propagates in the pane, and in which continuously received signals are compared with an undisturbed reception signal. <IMAGE>
Abstract (de)
Alarmsystem mit Ultraschall der sich in der Scheibe fortpflanzt, und bei dem fortlaufend empfangene Signale mit einem ungestörten Empfangssignal verglichen werden.
IPC 1-7
IPC 8 full level
G08B 13/04 (2006.01)
CPC (source: EP)
G08B 13/04 (2013.01)
Citation (search report)
- DE 2659978 A
- DE 2624035 A1 19761202 - MATSUSHITA ELECTRIC IND CO LTD
- DE 2541764 A1 19770324 - PHILIPS PATENTVERWALTUNG
- FR 2312827 A1 19761224 - MATSUSHITA ELECTRIC IND CO LTD [JP]
Designated contracting state (EPC)
AT BE CH FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0026383 A1 19810408; DE 2938968 A1 19810702; DK 405480 A 19810327; FI 803019 A 19810327; NO 802797 L 19810327
DOCDB simple family (application)
EP 80105486 A 19800912; DE 2938968 A 19790926; DK 405480 A 19800925; FI 803019 A 19800925; NO 802797 A 19800922