US3565509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four layered antireflection coatings
Assignee: Bausch and Lomb Inc
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Filing: 1969-03-27
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Granted: 1971-02-23
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Expires: 1989-03-27
Abstract
Abstract A MULTILAYER ANTIREFLECTION COATING USING A COMBINATION OF ONLY TWO FILMING MATERIALS IS AN IMPROVEMENT OVER KNOWN COATINGS THAT REQUIRE AT LEAST THREE FILMING MATERIALS. THE FILMING MATERIALS OF THE COATINGS DEPOSITED USING CONVENTIONAL TECHNIQUES ELIMINATING THE NEED OF AN ELECTRON BEAM EVAPORATION DEVICE. THE $/4 LAYER NEXT TO THE SUBSTRATE OF THE CONVENTIONAL 3-LAYER COATING IS IMPROVED UPON A ONE PERIOD EQUIVALENT LAYER.
Inventors
- 👤 Frank C Sulzbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:59
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/10; G02B1/11; G02B1/113; G02B1/115
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) | 1974-02-22 | 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 |