Patent US3245306A successfully refreshed from Google Patents.
US3245306A
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Photometer and method
Assignee: Alcoa Corp
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Filing: 1961-10-05
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Granted: 1966-04-12
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Expires: 1981-10-05
Abstract
No abstract record available.
Inventors
- 👤 Franklin R Potter
- 👤 William H Tingle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:07
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/55; G01N21/57
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A PHOTOMETER FOR DETERMINING IMAGE REFLECTIVELY OF SURFACES COMPRISING A SAMPLE MOUNT FOR PRESENTING A SURFACE FOR TEST, A LIGHT SOURCE AND PRIMARY MASK WITH TWO ADJACENT SLITS FOR PASSING LIGHT AND THEREBY PROJECTING IMAGES OF SAID SLITS ON THE TEST SURFACE, A LIGHT SENSING MEANS AND SECONDARY MASK WITH A SLIT FOR RECEIVING SAID IMAGES AS REFLECTED FROM THE TEST SURFACE, A LENS FOR FOCUSING SAID IMAGES UPON SAID SECONDARY MASK, AND MEANS FOR MOVING SAID SECONDARY MASK TO SCAN ACROSS SAID REFLECTED IMAGES, WHEREBY THE MAXIMUM LIGHT INTENSITY OF EITHER OF THE REFLECTED IMAGES AND ALSO THE MINIUM LIGHT INTENSITY BETWEEN THE TWO REFLECTED IMAGES MAY BE DETERMINED BY SAID LIGHT SENSING MEANS, THE RELATIONSHIP OF THE LATTER TO THE FORMER PROVIDING A MEASURE OF IMAGE REFLECTIVITY.
Claim 2
Dependent Claim
129 words
A PHOTOMETER FOR DETERMINING IMAGE REFLECTIVELY OF SURFACES COMPRISING A SAMPLE MOUNT FOR PRESENTING A SURFACE FOR TEST, A LIGHT SOURCE AND PRIMARY MASK WITH TWO ADJACENT SLITS FOR PASSING LIGHT AND THEREBY PROJECTING IMAGES OF SAID SLITS ON THE TEST SURFACE, A LIGHT SENSING MEANS AND SECONDARY MASK WITH A SLIT FOR RECEIVING SAID IMAGES AS REFLECTED FROM THE TEST SURFACE, A LENS FOR FOCUSING SAID IMAGES UPON SAID SECONDARY MASK, AND MEANS FOR MOVING SAID SECONDARY MASK TO SCAN ACROSS SAID REFLECTED IMAGES, WHEREBY THE MAXIMUM LIGHT INTENSITY OF EITHER OF THE REFLECTED IMAGES AND ALSO THE MINIUM LIGHT INTENSITY BETWEEN THE TWO REFLECTED IMAGES MAY BE DETERMINED BY SAID LIGHT SENSING MEANS, THE RELATIONSHIP OF THE LATTER TO THE FORMER PROVIDING A MEASURE OF IMAGE REFLECTIVITY.
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) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |