Patent US3091699A successfully refreshed from Google Patents.
US3091699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric device for indicating spots on a surface
Assignee: US Philips Corp
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Filing: 1960-08-31
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Granted: 1963-05-28
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Expires: 1980-08-31
Abstract
No abstract record available.
Inventors
- 👤 Hammar Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:53
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10821; G06K7/10851
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
194 words
A DEVICE FOR INDICATING SPOTS AND THE LIKE ON A SURFACE TO BE SCANNED COMPRISING A LIGHT SOURCE FOR LIGHTING THE SURFACE, A LIGHT SENSITIVE MEMBER FOR GENERATING AN ELECTRICAL SIGNAL WITH A STRENGTH DEPENDING UPON THE INTENSITY OF THE LIGHT REFLECTED FROM THE SURFACE, A BACKGROUND SURFACE BEHIND SAID SURFACE TO BE SCANNED, MEANS FOR EFFECTING A POINT-SHAPED RECIPROCATING SCANNING LIGHT ACROSS THE SURFACE IN OPPOSITE DIRECTION FROM THE SCANNED SURFACE TO THE BACKGROUND SURFACE, EACH OF SAID SCANNINGS BEING ARRANGED TO START ON SAID SCANNING SURFACE AND TERMINATING OUTSIDE OF THE SIDE EDGES OF SAID SURFACE, SAID SCANNING OUTSIDE OF THE SIDE EDGES BEING ARRANGED TO TAKE PLACE AGAINST A BACKGROUND WHICH, WHEN INDICATING DARK SPOTS, HAS GREATER REFLECTION POWER THAN SAID SCANNING SURFACE, AND WHEN INDICATING LIGHT SPOTS, HAS LESS REFLECTION POWER THAN SAID SURFACE, AN INDICATING MEMBER, A DIFFERENTIATING MEMBER, SAID ELECTRIC SIGNAL BEING FED TO SAID INDICATING MEMBER THROUGH SAID DIFFERENTIATING MEMBER AND SAID INDICATING MEMBER IS ARRANGED TO BE ACTUATED BY PULSES OF A POLARITY WHICH IS OPPOSITE TO THE POLARITY OF THE PULSES GENERATED BY SAID DIFFERENTIATING MEMBER WHEN SAID SCANNING PASSES ONE OF SAID SIDE EDGES.
Claim 2
Independent Claim
194 words
A DEVICE FOR INDICATING SPOTS AND THE LIKE ON A SURFACE TO BE SCANNED COMPRISING A LIGHT SOURCE FOR LIGHTING THE SURFACE, A LIGHT SENSITIVE MEMBER FOR GENERATING AN ELECTRICAL SIGNAL WITH A STRENGTH DEPENDING UPON THE INTENSITY OF THE LIGHT REFLECTED FROM THE SURFACE, A BACKGROUND SURFACE BEHIND SAID SURFACE TO BE SCANNED, MEANS FOR EFFECTING A POINT-SHAPED RECIPROCATING SCANNING LIGHT ACROSS THE SURFACE IN OPPOSITE DIRECTION FROM THE SCANNED SURFACE TO THE BACKGROUND SURFACE, EACH OF SAID SCANNINGS BEING ARRANGED TO START ON SAID SCANNING SURFACE AND TERMINATING OUTSIDE OF THE SIDE EDGES OF SAID SURFACE, SAID SCANNING OUTSIDE OF THE SIDE EDGES BEING ARRANGED TO TAKE PLACE AGAINST A BACKGROUND WHICH, WHEN INDICATING DARK SPOTS, HAS GREATER REFLECTION POWER THAN SAID SCANNING SURFACE, AND WHEN INDICATING LIGHT SPOTS, HAS LESS REFLECTION POWER THAN SAID SURFACE, AN INDICATING MEMBER, A DIFFERENTIATING MEMBER, SAID ELECTRIC SIGNAL BEING FED TO SAID INDICATING MEMBER THROUGH SAID DIFFERENTIATING MEMBER AND SAID INDICATING MEMBER IS ARRANGED TO BE ACTUATED BY PULSES OF A POLARITY WHICH IS OPPOSITE TO THE POLARITY OF THE PULSES GENERATED BY SAID DIFFERENTIATING MEMBER WHEN SAID SCANNING PASSES ONE OF SAID SIDE EDGES.
References Cited (Backward Citations)
US2017901A
Cited
US2414566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-05-27 | 1966-11-26 | 1967-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-27 | 1970-11-26 | 1971-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-27 | 1974-11-26 | 1975-05-28 | $7700.00 | Window Closed / Lapsed |