US2875087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming reflective surfaces
Assignee: American Optical Corp
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Filing: 1954-02-23
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Granted: 1959-02-24
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Expires: 1974-02-23
Abstract
No abstract record available.
Inventors
- 👤 Harry D Crandon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:37
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/602
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
101 words
A METHOD OF FORMING A PICTURE PROJECTION SCREEN WITH A HIGH REFLECTING SURFACE COMPRISING PLACING A VINYL RESIN FILM CONTAINING REFLECTIVE METALLIC FLAKES COATED WITH STEARIC ACID ON A SHEETLIKE BASE OF VINYL RESIN OF A CONTROLLED THICKNESS, WETTING SAID VINYL RESIN FILM TO CAUSE SAID FLAKES TO FLOAT AND BECOME ORIENTED WITH EACH OTHER, HEATING SAID VINYL RESIN FILM TO CAUSE IT TO SET AND RETAIN SAID FLAKES IN SAID ORIENTED RELATION AND EMBOSSING SAID REFLECTIVE SURFACE TO FORM CLOSELY RELATED DEPRESSIONS OF CONTROLLED SURFACE SHAPE THEREIN WHILE SUBSTANTIALLY RETAINING THE ORIENTED RELATION OF THE METALLIC FLAKES IN SAID DEPRESSIONS.
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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) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |