US2741157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-reflective coating for color filters
Assignee: Rollei Werke Franke und Heidecke GmbH and Co KG
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Filing: 1952-12-05
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Granted: 1956-04-10
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Expires: 1972-12-05
Abstract
No abstract record available.
Inventors
- 👤 Goethert Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:23
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/34; C03C17/3411; C03C17/3429; C03C17/3447; C03C17/3452; G; G02; G02B; G02B1/00; G02B1/10; G02B1/11; G02B1/113; G02B1/115
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
AS A NEW ARTICLE OF MANUFACTURE, AN ANTI-REFLECTIVE COLOR FILTER FOR PHOTOGRAPHIC PURPOSES COMPRISING A GLASS PLATE COLOR FILTER HAVING ON AN AIR-EXPOSED SURFACE THEREOF AN ANTI-REFLECTION COATING OF TWO LAYERS, THE LAYER NEXT TO THE GLASS BEING COMPOSED ESSENTIALLY OF TANTALUM OXIDE HAVING APPROXIMATELY THE THICKNESS INDICATED BY THE EXPRESSION
Claim 2
Dependent Claim
51 words
AS A NEW ARTICLE OF MANUFACTURE, AN ANTI-REFLECTIVE COLOR FILTER FOR PHOTOGRAPHIC PURPOSES COMPRISING A GLASS PLATE COLOR FILTER HAVING ON AN AIR-EXPOSED SURFACE THEREOF AN ANTI-REFLECTION COATING OF TWO LAYERS, THE LAYER NEXT TO THE GLASS BEING COMPOSED ESSENTIALLY OF TANTALUM OXIDE HAVING APPROXIMATELY THE THICKNESS INDICATED BY THE EXPRESSION
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-10 | 1959-10-10 | 1960-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-10 | 1963-10-10 | 1964-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-10 | 1967-10-10 | 1968-04-10 | $7700.00 | Window Closed / Lapsed |