Patent US3357230A successfully refreshed from Google Patents.
US3357230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for calibrating camera photometer
Assignee: Polaroid Corp
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Filing: 1964-12-09
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Granted: 1967-12-12
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Expires: 1984-12-09
Abstract
No abstract record available.
Inventors
- 👤 Jeremy M Topaz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:45
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/10; G01J1/12; G01J1/122; G01J1/124; G03; G03B; G03B43/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A METHOD FOR INDICATING THE CONDITION OF PHOTOMETRIC BALANCE IN A COMPARISON PHOTOMETER OF THE TYPE EMPLOYING A TARGET HAVING, IN A COMMON FIELD, TWO PORTIONS ILLUMINATED INDIVIDUALLY BY TWO DIFFERENT LIGHT SOURCES WHOSE RELATIVE INTENSITY CAN BE CONTROLLED FOR EQUALIZING THE BRIGHTNESS OF SAID TWO PORTIONS AND ATTAINING PHOTOMETRIC BALANCE COMPRISING THE STEPS OF: (A) MONITORING SAID TARGET WITH A TELEVISION CAMERA FOR PRODUCING A VIDEO SIGNAL THAT INCLUDES A COMPONENT WHOSE FREQUENCY IS FUNCTIONALLY RELATED TO THE ORIENTATION OF THE TARGET RELATIVE TO THE RASTER OF THE CAMERA AND THE GEOMETRY OF SAID TWO PORTIONS; (B) ADJUSTING THE RELATIVE BRIGHTNESS BETWEEN SAID TWO SOURCES; AND (C) DETECTING WHEN THE ADJUSTMENT IN RELATIVE BRIGHTNESS IS SUCH THAT SAID COMPONENT IS A MINIMUM WHEREBY SUCH ADJUSTMENT PROVIDES PHOTOMETRIC BALANCE.
Claim 2
Independent Claim
129 words
A METHOD FOR INDICATING THE CONDITION OF PHOTOMETRIC BALANCE IN A COMPARISON PHOTOMETER OF THE TYPE EMPLOYING A TARGET HAVING, IN A COMMON FIELD, TWO PORTIONS ILLUMINATED INDIVIDUALLY BY TWO DIFFERENT LIGHT SOURCES WHOSE RELATIVE INTENSITY CAN BE CONTROLLED FOR EQUALIZING THE BRIGHTNESS OF SAID TWO PORTIONS AND ATTAINING PHOTOMETRIC BALANCE COMPRISING THE STEPS OF: (A) MONITORING SAID TARGET WITH A TELEVISION CAMERA FOR PRODUCING A VIDEO SIGNAL THAT INCLUDES A COMPONENT WHOSE FREQUENCY IS FUNCTIONALLY RELATED TO THE ORIENTATION OF THE TARGET RELATIVE TO THE RASTER OF THE CAMERA AND THE GEOMETRY OF SAID TWO PORTIONS; (B) ADJUSTING THE RELATIVE BRIGHTNESS BETWEEN SAID TWO SOURCES; AND (C) DETECTING WHEN THE ADJUSTMENT IN RELATIVE BRIGHTNESS IS SUCH THAT SAID COMPONENT IS A MINIMUM WHEREBY SUCH ADJUSTMENT PROVIDES PHOTOMETRIC BALANCE.
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) | 1970-12-11 | 1971-06-12 | 1971-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-11 | 1975-06-12 | 1975-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-11 | 1979-06-12 | 1979-12-12 | $7700.00 | Window Closed / Lapsed |