US3888075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic clock
Assignee: TOPP ELECTRONICS Inc
•
Filing: 1974-01-25
•
Granted: 1975-06-10
•
Expires: 1994-01-25
Abstract
Abstract AC voltage input to a solid state, clock circuit having a 60 Hz sinusoidal waveform, is transmitted through field effect transistors to the light emitting diodes of a numeric display for time indicating purposes. The rectifying action of the light emitting diodes momentarily interrupts illumination in view of the AC drive, enabling use of high peak currents during short duty cycles.
Inventors
- 👤 Leon S Wecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:14
CPC Classifications
G; G04; G04G; G04G9/00; G04G9/08; G04G9/10; G04C; G04C23/00; G04C23/02; G04C23/12; G04G19/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
78 words
In combination with a source of AC voltage and a DC powered clock device having a plurality of outputs, a light emitting display having low current rectifying devices connected to said outputs, voltage rectifying means connected to said source for supplying DC energizing voltage to said clock device, and means connected to said source for transmitting a continuous, polarity changing excitation voltage to the low current rectifying devices of the display through the outputs of the clock device.
Claim 2
Dependent Claim
78 words
In combination with a source of AC voltage and a DC powered clock device having a plurality of outputs, a light emitting display having low current rectifying devices connected to said outputs, voltage rectifying means connected to said source for supplying DC energizing voltage to said clock device, and means connected to said source for transmitting a continuous, polarity changing excitation voltage to the low current rectifying devices of the display through the outputs of the clock device.
Claim 3
Dependent Claim
101 words
In combination with a source of AC voltage and a DC powered clock device having a plurality of outputs connected to a numeric display device, voltage rectifying means connected to said source for supplying DC energizing voltage to said clock device, and means connected to said source for transmitting a continuous, polarity changing excitation voltage to the numeric display device through the outputs of the clock device, said numeric display device including a plurality of light emitting diodes respectively connected to the outputs of the clock device and means connected to said source for biasing all of the light emitting diodes.
Claim 4
Dependent Claim
101 words
In combination with a source of AC voltage and a DC powered clock device having a plurality of outputs connected to a numeric display device, voltage rectifying means connected to said source for supplying DC energizing voltage to said clock device, and means connected to said source for transmitting a continuous, polarity changing excitation voltage to the numeric display device through the outputs of the clock device, said numeric display device including a plurality of light emitting diodes respectively connected to the outputs of the clock device and means connected to said source for biasing all of the light emitting diodes.
Claim 5
Dependent Claim
34 words
The combination of claim 2 including a radio adapted to be energized by said source, and switch means responsive to an alarm signal from the clock device for connecting the radio in said source.
Claim 6
Dependent Claim
20 words
The combination of claim 3 including means connected to said source for exciting all of the low current rectifying devices.
Claim 7
Dependent Claim
16 words
The combination of claim 2 wherein said clock device is a large scale integrated clock circuit.
Claim 8
Dependent Claim
16 words
The combination of claim 4 wherein said outputs of the clock device are field effect transistors.
Claim 9
Dependent Claim
16 words
The combination of claim 6 wherein said clock device is a large scale integrated clock circuit.
Claim 10
Dependent Claim
16 words
The combination of claim 7 wherein said outputs of the clock device are field effect transistors.
Claim 11
Dependent Claim
16 words
The combination of claim 6 wherein said outputs of the clock device are field effect transistors.
Claim 12
Dependent Claim
40 words
The combination of claim 9 wherein said numeric display device includes a plurality of light emitting diodes respectively connected to the outputs of the clock device and means connected to said source for biasing all of the light emitting diodes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |