Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1983-07-12
1985-12-10
Rowland, James L.
Communications: electrical
Condition responsive indicating system
With particular system function
250214AL, 307590, 315134, 340529, 340530, 340568, 340571, G08B 2300
Patent
active
045583072
ABSTRACT:
A box formed with an aperture in which a photosensitive cell is secured includes an electronic circuit connected to be fed by the electrical signal produced by the photosensitive cell when the latter is irradiated by ambient radiation. Said electronic circuit comprises a delay circuit adapted to receive the signal and arranged to produce a control signal when the cell has been irradiated for a predetermined time interval; an audible signal generator received in the box opposite apertures and connected to produce an audible signal in response to the control signal; and a circuit adapted to interrupt the audible signal after a predetermined time interval so that the audible signal is of predetermined duration.
The box has means for securing it to an object which is required not to be lost accidentally, e.g. keys, a wallet, a diary, etc. A cover can be provided for being placed over the cell to protect it and keep away external radiations when the reminder device is not required to be operative.
REFERENCES:
patent: 2407439 (1946-09-01), Olson
patent: 2519940 (1950-08-01), Smith et al.
patent: 3226705 (1965-12-01), Kaufman et al.
patent: 3300770 (1967-01-01), Brousseau et al.
patent: 3428861 (1969-02-01), Zinsmeyer
patent: 3656144 (1972-04-01), Forte
patent: 3728675 (1973-04-01), Horn et al.
patent: 3789220 (1974-01-01), Schacht
patent: 3797006 (1974-03-01), Reininger
patent: 3815118 (1974-06-01), McDonald
patent: 3889251 (1975-06-01), Litman
patent: 3909819 (1975-09-01), Radford
patent: 3930249 (1975-12-01), Steck et al.
patent: 3945728 (1976-03-01), Crandell
patent: 3969709 (1976-07-01), Isaacs et al.
patent: 3995268 (1976-11-01), Ferrari
patent: 4030087 (1977-06-01), Ritchie et al.
patent: 4090183 (1978-05-01), Miller
patent: 4101873 (1978-07-01), Anderson et al.
patent: 4155077 (1979-05-01), Rohan et al.
patent: 4197461 (1980-04-01), Umbarger et al.
patent: 4198563 (1980-04-01), Elssner
patent: 4223296 (1980-09-01), Kim et al.
patent: 4242670 (1980-12-01), Smith
patent: 4249160 (1981-02-01), Chilvers
patent: 4260982 (1981-04-01), DeBenedictis et al.
patent: 4291301 (1981-09-01), Chan
patent: 4294263 (1981-10-01), Hochman
patent: 4327360 (1982-04-01), Brown
patent: 4362970 (1982-12-01), Grady
patent: 4399431 (1983-08-01), Satomi et al.
Mullen Jr. Thomas J.
Rowland James L.
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