Patent USRE29483E successfully refreshed from Google Patents.
US3253128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overcoming light leakage in optical sensing
Assignee: Unisys Corp
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Filing: 1962-07-27
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Granted: 1966-05-24
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Expires: 1982-07-27
Abstract
No abstract record available.
Inventors
- 👤 Chen Wu
- 👤 William L Poland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:30
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10821; G06K7/10831
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
APPARATUS FOR OPTICAL SENSING OF A SHEET, THE BODY OF WHICH TRANSMITS LEAKAGE RADIATION THE MAXIMUM INTENSITY OF WHICH IT DEFLECTS TOWARD A PATH MORE NEARLY PERPENDICULAR TO THE SHEET; COMPRISING: (A) MEANS FOR MAINTAINING THE SHEET IN A SELECTED PLANE AT SELECTED LOCATION; (B) A SOURCE POSITIONED ON ONE SIDE OF THE SELECTED PLANE FOR DIRECTING RADIATION TOWARD THE SELECTED LOCATION SO THAT THE RADIATION IS PARTLY BLOCKED WHEN SHEET MATERIAL IS PRESENT AT THAT LOCATION; (C) AND MEANS POSITIONED ON THE OTHER SIDE OF THE SELECTED PLANE FOR SENSING THE INTENSITY OF RADIATION TRAVERSING THE SELECTED LOCATION OF DETERMINE THE PRESENCE OF SHEET MATERIAL AT THAT LOCATION; (D) THE RADIATION SOURCE AND THE SENSING MEANS BEING OFFSET ON OPPOSITE SIDES OF A LINE EXTENDING THROUGH THE SELECTED LOCATION PERPENDICULAR TO THE SELECTED PLANE, SAID SENSING MEANS BEING FURTHER POSITIONED AT A DISTANCE FROM SAID SELECTED LOCATION TO BY-PASS SAID MAXIMUM INTENSITY LEAKAGE RADIATION WHICH HAS BEEN DEFLECTED TOWARD SAID PATH MORE NEARLY PERPENDICULAR TO SAID SHEET.
Claim 2
Dependent Claim
168 words
APPARATUS FOR OPTICAL SENSING OF A SHEET, THE BODY OF WHICH TRANSMITS LEAKAGE RADIATION THE MAXIMUM INTENSITY OF WHICH IT DEFLECTS TOWARD A PATH MORE NEARLY PERPENDICULAR TO THE SHEET; COMPRISING: (A) MEANS FOR MAINTAINING THE SHEET IN A SELECTED PLANE AT SELECTED LOCATION; (B) A SOURCE POSITIONED ON ONE SIDE OF THE SELECTED PLANE FOR DIRECTING RADIATION TOWARD THE SELECTED LOCATION SO THAT THE RADIATION IS PARTLY BLOCKED WHEN SHEET MATERIAL IS PRESENT AT THAT LOCATION; (C) AND MEANS POSITIONED ON THE OTHER SIDE OF THE SELECTED PLANE FOR SENSING THE INTENSITY OF RADIATION TRAVERSING THE SELECTED LOCATION OF DETERMINE THE PRESENCE OF SHEET MATERIAL AT THAT LOCATION; (D) THE RADIATION SOURCE AND THE SENSING MEANS BEING OFFSET ON OPPOSITE SIDES OF A LINE EXTENDING THROUGH THE SELECTED LOCATION PERPENDICULAR TO THE SELECTED PLANE, SAID SENSING MEANS BEING FURTHER POSITIONED AT A DISTANCE FROM SAID SELECTED LOCATION TO BY-PASS SAID MAXIMUM INTENSITY LEAKAGE RADIATION WHICH HAS BEEN DEFLECTED TOWARD SAID PATH MORE NEARLY PERPENDICULAR TO SAID SHEET.
References Cited (Backward Citations)
US2916624A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-23 | 1969-11-22 | 1970-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-23 | 1973-11-22 | 1974-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-23 | 1977-11-22 | 1978-05-24 | $7700.00 | Window Closed / Lapsed |