Protective coating for surfaces of silver and mirror fabrication
Abstract
Abstract THE PRESENT INVENTION INCLUDES A PROTECTIVE COATING FOR HIGHLY REFLECTIVE SURFACES OF SILVER OR SILVER ALLOYS AND IS ACCOMPLISHED BY APPLYING A TRANSPARENT LAYER OF ALUMINUM OXIDE TO THE SURFACE OF SILVER TO BE PROTECTED AND THEREAFTER APPLYING A TRANSPARENT LAYER OF QUARTZ (SILICON DIOXIDE) OVER THE LAYER OF ALUMINUM OXIDE. IN ADDITION THE SILVER IS SECURED ON ITS NON-REFLECTING SURFACE TO A LAYER OF CHROMIUM-NICKEL ALLOY. THE ENTIRE FOUR LAYER PACKAGE CAN BE READILY SECURED TO A SILICEOUS SUBSTRATE, TO A PLASTIC SUBSTRATE OR TO A HIGHLY POLISHED METAL SUBSTRATE AND WILL WITHSTAND THE NORMAL TESTING PROGRAM. FURTHER IF THERE IS A LAYER OF ALUMINUM BETWEEN THE CHROMIUM NICKEL ALLOY AND CERTAIN SUBSTRATES THE ENTIRE PACKAGE CAN BE READILY PEELED OFF THESE SUBSTRATES AS IS SOMETIMES NECESSARY WHEN PRODUCING LARGE MIRRORS.
Inventors
- 👤 Harvey N Adams
Bibliographic Details
Claims Analysis
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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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |