US3565508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Birefringent polarizing prism and beam-splitter and method of producing same
Assignee: FRANK J DUMONT
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Filing: 1968-04-26
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Granted: 1971-02-23
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Expires: 1988-04-26
Abstract
Abstract A GROWN OR FRESHLY CLEAVED LAYER OF A BIREFRINGENT CRYSTAL IS POSITIONED BETWEEN CONFRONTING, PLANE, ATOMISTICALLY CLEAN SURFACES OF TWO PRISM SUBSTRATES, SAID SURFACES BEING MATCHED TO WITHIN 1/10 WAVE ACCURACY SO THAT THEY ARE DISPOSED IN OPTICAL CONTACT WITH OPPOSITE SIDES OF THE LAYER, WHEREBY THE LAYER IS SECURED BY ADHESION BETWEEN THE SUBSTRATES TO FORM A POLARIZING PRISM. THE LAYER OF BIREFRINGENT MATERIAL MAY BE MUSCOVITE MICA; AND THE ASSEMBLY IS MADE IN A DUST-FREE ATMOSPHERE TO PREVENT DUST PARTICLES AND THE LIKE FROM BEING INTERPOSED BETWEEN THE MICA AND GLASS SUBSTRATES.
Inventors
- 👤 Frank J Dumont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:48
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/28; G02B27/283
Claims Analysis
Total Claims: 0
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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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |