US3754913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a colored transparent photo mask
Assignee: EIICHI INOUE AND CANON K K
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Filing: 1971-05-07
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Granted: 1973-08-28
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Expires: 1991-05-07
Abstract
Abstract This invention relates to a colored, transparent photo-mask consisted of a transparent base plate and a colored, transparent visible image made of a colored inorganic material. Also this invention relates to a method for producing the colored, transparent photo-mask.
Inventors
- 👤 S Takeuchi
- 👤 K Tsuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:04
CPC Classifications
G; G03; G03F; G03F1/00; G03F1/38; G03F1/54
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
43 words
The method according to claim 1, wherein the transparent glass plate is under-coated with a thin layer of a member selected from the group consisting of chromium and aluminum by vapor evaporating or sputtering the chromium or aluminum on the transparent glass plate.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |