Patent US3187652A successfully refreshed from Google Patents.
US3187652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for measuring light
Assignee: Individual
•
Filing: 1960-01-04
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Granted: 1965-06-08
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Expires: 1980-01-04
Abstract
No abstract record available.
Inventors
- 👤 Wolcott S Kinnard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:02
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/10; G01J1/12; G01J1/122; G01J1/124; G01J1/126
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
110 words
A METER OF THE CHARACTER DESCRIBED COMPRISING THE COMBINATION WITH A PHOTO-CONDUCTIVE CELL AND A NEON GLOW LAMP SHUNTED BY A RESISTOR, THE SAID CELL AND GLOW LAMP HAVING A SERIES CONNECTION AND MEANS FOR SUPPLYING CURRENT THERETO, OF A VARIABLE DENSITY SCREEN HAVING A MOUNTING UPON WHICH IT IS MOVABLE ACROSS SAID CELL IN A MANNER TO VARY THE AMOUNT OF LIGHT REACHING SAID CELL FROM A GIVEN SOURCE TO WHICH THE CELL IS EXPOSED THROUGH SAID SCREEN, THE SCREEN COMPRISING OPAQUE AREAS HAVING MINUTE TRANSPARENT OPENINGS OF PROGRESSIVELY VARYING AREA, THE SAID TRANSPARENT OPENINGS BEING SPANNED BY MEANS FOR DIFFUSING LIGHT PASSING THROUGH SAID OPENINGS TOWARD SAID CELL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-07 | 1968-12-07 | 1969-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-07 | 1972-12-07 | 1973-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-07 | 1976-12-07 | 1977-06-08 | $7700.00 | Window Closed / Lapsed |