Patent US3552826A successfully refreshed from Google Patents.
US3552826A
Expired / Lapsed
US
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Variable interference reflector
Assignee: Canadian Patents and Development Ltd
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Filing: 1968-02-19
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Granted: 1971-01-05
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Expires: 1988-02-19
Abstract
Abstract A REFLECTOR DEVICE CAPABLE OF PROVIDING A DESIRED VALUE OF REFLECTANCE AND HAVING A MULTI-LAYER REFLECTING SURFACE WHICH GRADUALLY DECREASES IN THICKNESS, FOR EXAMPLE EXPONENTIALY, FROM ONE END TO THE OTHER END SO THAT THE REFLECTANCE VALUE AT ANY POINT IS DEPENDENT ON THE POSITION OF THE POINT AND VARIES LOGARITHMICALLY ACROSS THE SURFACE. THE DEVICE IS PROVIDED WITH TWO CONTROLS, ONE BEING A REFLECTANCE ADJUSTMENT CONTROL AND THE OTHER A WAVELENGTH ADJUSTMENT CONTROL.
Inventors
- 👤 Garnet R Hanes
- 👤 Jerzy A Dobrowolski
- 👤 Cornelis J Van Der Hoeven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:19
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/28; G02B5/285; G01; G01J; G01J3/00; G01J3/12
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |