US3361025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus of detecting flaws in transparent bodies
Assignee: Compagnie de Saint Gobain SA
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Filing: 1961-12-11
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Granted: 1968-01-02
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Expires: 1981-12-11
Abstract
No abstract record available.
Inventors
- 👤 Gaffard Jean Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:17
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; G01N21/892; G01N21/896; G01N21/17; G01N21/41; G01N21/45
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
THE METHOD OF DETECTING THE PRESENCE AND LOCATION OF FLAWS IN A PLANE SHEET OF TRANSPARENT MATERIAL MOVING IN THE PLANE THEREOF, COMPRISING, PASSING LIGHT FROM A POINT SOURCE THROUGH A FIRST PLATE HAVING AN OPAQUE CENTRAL AREA OF PREDETERMINED SIZE AND SHAPE, FOCUSING AT A POINT ON SAID SHEET, RAYS PASSING THROUGH SAID FIRST PLATE, FOCUSSING SAID RAYS AT THE OTHER SIDE OF SAID SHEET TOWARD A SECOND OPAQUE PLATE HAVING A CENTRAL OPENING CORRESPONDING IN SIZE AND SHAPE TO THE IMAGE OF SAID OPAQUE CENTRAL AREA PROJECTED THEREON, AND DETECTING LIGHT DEFLECTED INTO AND THROUGH SAID OPENING BY IMPERFECTIONS IN SAID SHEET AT THE POINT THEREOF INSTANTANEOUSLY TRAVERSED BY SAID RAYS.
Claim 2
Independent Claim
113 words
THE METHOD OF DETECTING THE PRESENCE AND LOCATION OF FLAWS IN A PLANE SHEET OF TRANSPARENT MATERIAL MOVING IN THE PLANE THEREOF, COMPRISING, PASSING LIGHT FROM A POINT SOURCE THROUGH A FIRST PLATE HAVING AN OPAQUE CENTRAL AREA OF PREDETERMINED SIZE AND SHAPE, FOCUSING AT A POINT ON SAID SHEET, RAYS PASSING THROUGH SAID FIRST PLATE, FOCUSSING SAID RAYS AT THE OTHER SIDE OF SAID SHEET TOWARD A SECOND OPAQUE PLATE HAVING A CENTRAL OPENING CORRESPONDING IN SIZE AND SHAPE TO THE IMAGE OF SAID OPAQUE CENTRAL AREA PROJECTED THEREON, AND DETECTING LIGHT DEFLECTED INTO AND THROUGH SAID OPENING BY IMPERFECTIONS IN SAID SHEET AT THE POINT THEREOF INSTANTANEOUSLY TRAVERSED BY SAID RAYS.
References Cited (Backward Citations)
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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) | 1971-01-01 | 1971-07-03 | 1972-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-01 | 1975-07-03 | 1976-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-01 | 1979-07-03 | 1980-01-02 | $7700.00 | Window Closed / Lapsed |