US3586444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Striaescope for inspecting a transparent object submerged in a liquid having the same index of refraction
Assignee: American Optical Corp
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Filing: 1970-01-30
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Granted: 1971-06-22
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Expires: 1990-01-30
Abstract
Abstract A device for photographically recording the location and amount of striae, cracks and inclusions in long rods of glass. A rod of glass placed in an immersion liquid having an index of refraction matching that of the rod is scanned from one end to another thereof by a slit of high intensity collimated light directed into the rod perpendicularly to its axis and a strip of photographic film extending along the length of the rod is exposed by portions of the scanning light transmitted through the rod whereby a shadowgraphic recording of the striae, cracks and/or inclusions is produced upon the film.
Inventors
- 👤 Merrill F Sproul
- 👤 Richard D Courtemanche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:09
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/95; G01N21/958; G02; G02B; G02B27/00; G02B27/50; G02B27/54
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
177 words
A striaegraph for making shadowgraphic recordings of striae and other defects within long billets of glass, the striaegraph comprising: an elongated immersion tank for receiving a glass billet to be examined, said tank having transparent walls and containing an immersion liquid of a refractive index approximately matching the refractive index of the billet; a source of collimated light; means for directing said collimated light through said tank and a billet placed therein along lines substantially perpendicular to the axis of the billet; a holder for receiving and supporting a length of photographic film with the film extended parallel to said axis of the billet and arranged to receive light transmitted through said walls of said tank and billet; means for forming a slit of said collimated light on said film; and means for moving said slit of light and said billet one relative to the other at a uniform rate so as to expose all sections of the length of said billet to said light for photographically producing a developable shadowgraph of said billet upon said film.
Claim 2
Dependent Claim
177 words
A striaegraph for making shadowgraphic recordings of striae and other defects within long billets of glass, the striaegraph comprising: an elongated immersion tank for receiving a glass billet to be examined, said tank having transparent walls and containing an immersion liquid of a refractive index approximately matching the refractive index of the billet; a source of collimated light; means for directing said collimated light through said tank and a billet placed therein along lines substantially perpendicular to the axis of the billet; a holder for receiving and supporting a length of photographic film with the film extended parallel to said axis of the billet and arranged to receive light transmitted through said walls of said tank and billet; means for forming a slit of said collimated light on said film; and means for moving said slit of light and said billet one relative to the other at a uniform rate so as to expose all sections of the length of said billet to said light for photographically producing a developable shadowgraph of said billet upon said film.
Claim 3
Dependent Claim
93 words
A striaegraph according to claim 1 wherein said means for forming said slit of collimated light comprises a pair of opaque light occluding pieces having parallel straight edges adjustable toward and away from each other according to the width desired of said slit of light and said means for moving said slit of light at said uniform rate includes speed control means whereby variations in said rate and width of said slit may be effected for control of the time of exposure of said film in producing said developable shadowgraph of said billet.
Claim 4
Dependent Claim
54 words
A striaegraph according to claim 1 wherein said holder for receiving and supporting said length of photographic film comprises a platen, said platen having grooves therein over which said film is extended and further including means for evacuating air and gases from said grooves for holding said film tightly and smoothly against said platen.
Claim 5
Dependent Claim
71 words
A striaegraph according to claim 1 wherein said film holder comprises an elongated light-tight box having an elongated frontal opening over which is extended an opaque belt, said belt having a slit extending transversely therethrough for forming said slit of collimated light on said film and means for moving said belt longitudinally of its length along said frontal opening of said box for photographically producing said developable shadowgraph of said billet.
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |