Patent US3665442A successfully refreshed from Google Patents.
US3665442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-voltage sensitive indicator light
Assignee: Individual
•
Filing: 1969-06-02
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Granted: 1972-05-23
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Expires: 1989-06-02
Abstract
Abstract An indicator light unit comprising a field effect current regulator diode in series with a gallium arsenide phosphide diode (solid state light). This configuration when connected across a pair of terminals such as the firing circuit of an airborne rocket, will enable the detection of stray voltages on the terminals considerably below the normal firing voltage without damage to the light when the operating voltage is impressed.
Inventors
- 👤 William Thomas Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:22
CPC Classifications
G; G08; G08B; G08B21/00; G08B21/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
An indicator light operable over a wide range of voltages comprising: a light emitting diode; a current limiting device comprised of at least one field effect current regulating diode connected in series with said light emitting diode; said current limiting device providing substantially constant illumination from said light emitting diode over a range of approximately 2 1/2 volts to 100 volts; a second light emitting diode emitting diode connected in the opposite polarity of said first light emitting diode; and a second current limiting device connected in series with said second light emitting diode; said second diode being connected in parallel with the first mentioned diodes whereby the combination is responsive to voltages of either polarity on either terminal.
Claim 2
Dependent Claim
19 words
An indicator light as defined in claim 1 wherein said light emitting diode is a gallium arsenide phosphide diode.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |