US3691045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making photochromic films on glass substrates
Assignee: Corning Glass Works
•
Filing: 1971-03-15
•
Granted: 1972-09-12
•
Expires: 1991-03-15
Abstract
Abstract A METHOD IS DISCLOSED FOR FORMING ON A GLASS SUBSTRATE A FILM EXHIBITING PHOTOCHROMIC PROPERTIES. A MIXED OXIDE FILM CONTAINING SILVER OXIDE IN ADDITION TO TANTALUM OXIDE, TUNGSTEN OXIDE, OR MIXTURES THEREOF IS REACTIVELY SPUTTERED ON A GLASS SUBSTRATE. EXCESS SILVER OXIDE IS REMOVED FROM THE FILM BY IMMERSING THE FILM IN AN ACID SOLUTION UNTIL THE FILM, WHICH IS BLACK TO BROWN WHEN DEPOSITED, BECOMES SUBSTANTIALLY COLORLESS. THE PHOTOCHROMIC PROPERTIES OF THE FILM ARE ENHANCES BY HEATING THE SUBSTRATE-FILM COMPOSITE AT A TEMPERATURE OF AT LEAST 300*C. FOR AT LEAST 1/2 HOUR.
Inventors
- 👤 Morton L Lieberman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:03
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/58; C23C14/5873; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C17/245; C23C14/06; C23C14/08; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/23; C03C2218/00; C03C2218/10; C03C2218/15; C03C2218/154; C03C2218/155; C03C2218/30; C03C2218/32
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |