US3815997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photo prismatique polariscope
Assignee: Individual
•
Filing: 1972-10-02
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Granted: 1974-06-11
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Expires: 1992-10-02
Abstract
Abstract An opthalmic lens tester is disclosed which employs a source of conventional incandescent light coupled with a reflecting dispersive prism and a pair of crossed polarizers to determine chemical or stress hardening conditions of such lenses. The tester also employs a source of ''''black'''' light to test a lens to determine if it is of the Photosun or the Photogray type.
Inventors
- 👤 S Alaska
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:22
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/21; G01M; G01M11/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
130 words
In a prismatic polariscope, a supporting structure, an incandescent light source in said supporting structure, a dispersing, reflecting prism means on said supporting structure adjacent said incandescent light source for receiving light from said incandescent light source; a first polarized filter on said supporting structure contiguous to said dispersing, reflecting prism means for polarizing light from said dispersing, reflecting prism means; a second polarized filter on said supporting structure in approximately 90* axis opposition to the first polarized filter axis, and spaced from said first polarized filter; black light means on said supporting structure; light switch means for said incandescent light source and said black light means; said supporting structure supporting lenses to be viewed between said first and second polarized filters and in juxtaposition with said black light means.
Claim 2
Dependent Claim
130 words
In a prismatic polariscope, a supporting structure, an incandescent light source in said supporting structure, a dispersing, reflecting prism means on said supporting structure adjacent said incandescent light source for receiving light from said incandescent light source; a first polarized filter on said supporting structure contiguous to said dispersing, reflecting prism means for polarizing light from said dispersing, reflecting prism means; a second polarized filter on said supporting structure in approximately 90* axis opposition to the first polarized filter axis, and spaced from said first polarized filter; black light means on said supporting structure; light switch means for said incandescent light source and said black light means; said supporting structure supporting lenses to be viewed between said first and second polarized filters and in juxtaposition with said black light means.
Claim 3
Dependent Claim
29 words
The structure as defined in claim 1 and further including means for electrically connecting said incandescent light source and said black light means to a source of electrical energy.
Claim 4
Dependent Claim
20 words
The structure as defined in claim 1 wherein said supporting structure is constructed for supporting ophthalmic lenses of eye glasses.
References Cited (Backward Citations)
US2073691A
Cited
US3520608A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |