Card – picture – or sign exhibiting – Display card – Having a curved display panel
Patent
1991-10-10
1993-02-02
Muir, D. Neal
Card, picture, or sign exhibiting
Display card
Having a curved display panel
40455, 40906, 446147, 446397, 446484, G09F 112, G09F 2700, A63H 3338, A63H 500
Patent
active
051828723
ABSTRACT:
A sound producing control switch for a picture-frame, includes a control circuit which is fastened in the back cover of a picture-frame. The control circuit includes a music IC, a battery power supply and a speaker, a conductive strip fastened in the picture-frame at the inside, two leaf springs mounted on the window glass of the picture-frame, which leaf springs are respectively connected to the two opposite terminals of the control circuit and constantly forced to contact the conductive strip by two spring means. The control circuit is triggered to produce the sound of "I Love You" twice when the picture-frame is touched to produce a short circuit signal. The spring means automatically force the leaf springs to contact the conductive strip immediately after the leaf springs have been forced to disconnect from the conductive strip.
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patent: 4696653 (1987-09-01), McKeefery
patent: 4703573 (1987-11-01), Montgomery et al.
patent: 4748756 (1988-06-01), Ross
patent: 4791741 (1988-12-01), Kondo
patent: 4836075 (1989-06-01), Armstrong
Kao Jack
Lee Larry
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