US3559090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polarization free beam divider
Assignee: CAMBRIDGE INSTRUMENTS Inc A DEL CORP
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Filing: 1968-10-08
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Granted: 1971-01-26
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Expires: 1988-10-08
Abstract
Abstract A VIRTUALLY POLARIZATION FREE BEAM DIVIDER COMPRISES TWO 45* OPTICAL PRISMS POSITIONED WITH THEIR HYPOTENUSE SURFACES FACING EACH OTHER WITH A MULTI-LAYER THIN FILM STRUCTURE POSITIONED BETWEEN THE FACING SURFACES OF THE PRIMS. THE MULTILAYER THIN FILM STRUCTURE IS COMPOSED OF A FIRST LAYER OF A DIELECTRIC MATERIAL, A SECOND LAYER OF A METAL AND A THIRD LAYER OF A DIELECTRIC MATERIAL.
Inventors
- 👤 Stanley J Refermat
- 👤 Arthur F Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:54
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/10; G02B27/1073; G02B27/14; G02B27/142; G02B27/144
Claims Analysis
Total Claims: 0
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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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |