Patent US3202043A successfully refreshed from Google Patents.
US3202043A
Expired / Lapsed
US
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Method and apparatus for photoelectrically inspecting glass
Assignee: PPG Industries Inc
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Filing: 1964-10-02
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Granted: 1965-08-24
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Expires: 1984-10-02
Abstract
No abstract record available.
Inventors
- 👤 William F Galey
- 👤 Jr Hugh E Shaw
- 👤 George E Sleighter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:00
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; G01N21/892; G01N21/896
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
APPARATUS FOR DETECTING THE PRESENCE OF DEFECTS IN AND ON THE SURFACE OF A PIECE OF GLASS HAVING EXTENSIVE, SENSIBLY SMOOTH SURFACES THAT ARE SUBSTANTIALLY PLANAR IN THE INSTANT TEST AREA, COMPRISING: A SOURCE OF LIGHT OF GIVEN INTENSITY POSITIONED SO AS TO PROVIDE A BEAM OF LIGHT INTERSECTING SAID GLASS; MEANS, INCLUDING AN OBJECTIVE LENS, FOR PRESENTING IMAGES OF SAID DEFECTS FORMED BY SAID BEAM; MEANS, INCLUDING A LIGHT SENSITIVE ELEMENT ALIGNED WITH SAID BEAM, RESPONSIVE TO VARIATIONS IN LIGHT INTENSITY OF SAID BEAM WHICH FORMS SAID IMAGES TO PROVIDE SIGNALS INDICATIVE OF THE PRESENCE AND LOCATION OF SAID DEFECTS; AND MEANS IN THE PATH OF LIGHT BETWEEN SAID SOURCE AND SAID LIGHT SENSITIVE ELEEMENT TO INTERRUPT THE MAJOR PORTION OF SAID LIGHT BEAM AND PERMIT A SMALL PORTION ONLY OF SAID LIGHT BEAM, CORRELATED IN SIZE WITH A MAXIMUM ACCEPTABLE DEFECT SIZE SO AS TO INDICATE BY PERCEPTIBLE INTENSITY DIFFERENCES IN SAID INCREMENTS OF LIGHT THE PRESENCE OF ANY LARGER DEFECT, TO IMPINGE UPON SAID LIGHT SENSITIVE ELEMENT.
Claim 2
Dependent Claim
170 words
APPARATUS FOR DETECTING THE PRESENCE OF DEFECTS IN AND ON THE SURFACE OF A PIECE OF GLASS HAVING EXTENSIVE, SENSIBLY SMOOTH SURFACES THAT ARE SUBSTANTIALLY PLANAR IN THE INSTANT TEST AREA, COMPRISING: A SOURCE OF LIGHT OF GIVEN INTENSITY POSITIONED SO AS TO PROVIDE A BEAM OF LIGHT INTERSECTING SAID GLASS; MEANS, INCLUDING AN OBJECTIVE LENS, FOR PRESENTING IMAGES OF SAID DEFECTS FORMED BY SAID BEAM; MEANS, INCLUDING A LIGHT SENSITIVE ELEMENT ALIGNED WITH SAID BEAM, RESPONSIVE TO VARIATIONS IN LIGHT INTENSITY OF SAID BEAM WHICH FORMS SAID IMAGES TO PROVIDE SIGNALS INDICATIVE OF THE PRESENCE AND LOCATION OF SAID DEFECTS; AND MEANS IN THE PATH OF LIGHT BETWEEN SAID SOURCE AND SAID LIGHT SENSITIVE ELEEMENT TO INTERRUPT THE MAJOR PORTION OF SAID LIGHT BEAM AND PERMIT A SMALL PORTION ONLY OF SAID LIGHT BEAM, CORRELATED IN SIZE WITH A MAXIMUM ACCEPTABLE DEFECT SIZE SO AS TO INDICATE BY PERCEPTIBLE INTENSITY DIFFERENCES IN SAID INCREMENTS OF LIGHT THE PRESENCE OF ANY LARGER DEFECT, TO IMPINGE UPON SAID LIGHT SENSITIVE ELEMENT.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |