US2708389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectral wedge interference filter combined with purifying filters
Assignee: Individual
•
Filing: 1951-01-09
•
Granted: 1955-05-17
•
Expires: 1971-01-09
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Kavanagh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:17
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/28; G01; G01J; G01J3/00; G01J3/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
SPECTRUM PRODUCING MEANS COMPRISING A WEDGE INTERFERENCE FILTER AND AT LEAST TWO DIFFERENT COLOR FILTERS PLACED SIDE BY SIDE AND PERMANENTLY ATTACHED TO THE WEDGE INTERFERENCE FILTER, EACH OF SAID COLOR FILTERS PASSING LIGHT OF WAVELENGTHS WITHIN THE RANGE OF THE SPEC-
Claim 2
Dependent Claim
42 words
SPECTRUM PRODUCING MEANS COMPRISING A WEDGE INTERFERENCE FILTER AND AT LEAST TWO DIFFERENT COLOR FILTERS PLACED SIDE BY SIDE AND PERMANENTLY ATTACHED TO THE WEDGE INTERFERENCE FILTER, EACH OF SAID COLOR FILTERS PASSING LIGHT OF WAVELENGTHS WITHIN THE RANGE OF THE SPEC-
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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) | 1958-05-16 | 1958-11-15 | 1959-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-16 | 1962-11-15 | 1963-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-16 | 1966-11-15 | 1967-05-17 | $7700.00 | Window Closed / Lapsed |