US3334309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-to-frequency converter circuit
Assignee: Fairchild Semiconductor Corp
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Filing: 1966-02-01
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Granted: 1967-08-01
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Expires: 1986-02-01
Abstract
No abstract record available.
Inventors
- 👤 Howard E Murphy
- 👤 Louis J Kabell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:10
CPC Classifications
H; H03; H03K; H03K7/00; H03K7/06; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/50; H03K4/501
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
APPARATUS FOR CONVERTING LIGHT RECEIVED FROM A SOURCE OF LIGHT TO AN ELECTRICAL SIGNAL, THE FREQUENCY OF WHICH IS REPRESENTATIVE OF THE INTENSITY OF SAID LIGHT COMPRISING COMPARATOR MEANS FOR PROVIDING AN OUTPUT SIGNAL WHEN THE AMPLITUDE OF A SIGNAL APPLIED TO ITS INPUT EXCEEDS A PREDETERMINED THRESHOLD VALUE, SWITCHING MEANS RESPONSIVE TO AN OUTPUT SIGNAL FROM SAID COMPARATOR MEANS FOR APPLYING A REFERENCE SIGNAL AT SAID COMPARATOR MEANS INPUT HAVING A REFERENCE LEVEL UPON SAID AMPLITUDE EXCEEDING SAID THRESHOLD VALUE, AND PHOTODIODE MEANS CONNECTED TO SAID COMPARATOR MEANS INPUT FOR CHANGING SAID REFERENCE SIGNAL TOWARD SAID THRESHOLD VALUE AT A RATE DETERMINED BY THE ILLUMINATION INTENSITY FALLING ON SAID PHOTODIODE WHEREBY SAID COMPARATOR OUTPUT SIGNAL FREQUENCY IS REPRESENTATIVE OF THE INTENSITY OF SAID LIGHT.
Claim 2
Dependent Claim
125 words
APPARATUS FOR CONVERTING LIGHT RECEIVED FROM A SOURCE OF LIGHT TO AN ELECTRICAL SIGNAL, THE FREQUENCY OF WHICH IS REPRESENTATIVE OF THE INTENSITY OF SAID LIGHT COMPRISING COMPARATOR MEANS FOR PROVIDING AN OUTPUT SIGNAL WHEN THE AMPLITUDE OF A SIGNAL APPLIED TO ITS INPUT EXCEEDS A PREDETERMINED THRESHOLD VALUE, SWITCHING MEANS RESPONSIVE TO AN OUTPUT SIGNAL FROM SAID COMPARATOR MEANS FOR APPLYING A REFERENCE SIGNAL AT SAID COMPARATOR MEANS INPUT HAVING A REFERENCE LEVEL UPON SAID AMPLITUDE EXCEEDING SAID THRESHOLD VALUE, AND PHOTODIODE MEANS CONNECTED TO SAID COMPARATOR MEANS INPUT FOR CHANGING SAID REFERENCE SIGNAL TOWARD SAID THRESHOLD VALUE AT A RATE DETERMINED BY THE ILLUMINATION INTENSITY FALLING ON SAID PHOTODIODE WHEREBY SAID COMPARATOR OUTPUT SIGNAL FREQUENCY IS REPRESENTATIVE OF THE INTENSITY OF SAID LIGHT.
References Cited (Backward Citations)
US3287975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-31 | 1971-01-30 | 1971-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-31 | 1975-01-30 | 1975-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-31 | 1979-01-30 | 1979-08-01 | $7700.00 | Window Closed / Lapsed |