US4003635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mosaic interference filter
Assignee: United States Department of the Navy
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Filing: 1968-03-27
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Granted: 1977-01-18
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Expires: 1988-03-27
Abstract
Abstract A narrow-band interference filter is placed in the path of reflected opti energy for rejecting undesirable signals to thereby improve the signal-to-noise ratio. The interference filter functions as a bandpass filter having a center frequency centered around the frequency of the transmitted optical beam. The filter includes four identical quarter annulus sections, each composed of a mosaic of interference filter elements cemented to a glass substrate. Each substrate is itself positioned within a skeletal spider structure to provide the desired shape and rigidity.
Inventors
- 👤 Walter H. Ottersberg
- 👤 Michael T. Rubertone
- 👤 Tarald H. Oigarden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:59
CPC Classifications
G; G01; G01S; G01S17/00; G01S17/02; G01S17/06; G01S17/08; G02; G02B; G02B5/00; G02B5/20; G02B5/201
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
73 words
An optical filter comprising: a plurality of filter segments of substantially the same filter characteristics in abutting relationship secured to a substrate and forming a mosaic pattern on said substrate with the space between said segments sealed with an opaque material, for providing a narrow band interference filter with a high percentage of transmission at a selected wavelength; and a supporting structure to which said substrate is secured by a substantially compressional force.
Claim 2
Dependent Claim
73 words
An optical filter comprising: a plurality of filter segments of substantially the same filter characteristics in abutting relationship secured to a substrate and forming a mosaic pattern on said substrate with the space between said segments sealed with an opaque material, for providing a narrow band interference filter with a high percentage of transmission at a selected wavelength; and a supporting structure to which said substrate is secured by a substantially compressional force.
Claim 3
Dependent Claim
24 words
An optical filter as recited in claim 1 wherein said supporting structure has an aperture, the periphery of which provides support for said substrate.
Claim 4
Dependent Claim
21 words
An optical filter as recited in claim 2 further comprising: means for clamping said substrate to the periphery of said aperture.
Claim 5
Dependent Claim
62 words
An optical filter as recited in claim 3 wherein said supporting structure comprises: an annular shaped spider member having a plurality of apertures therein; a like plurality of substrates supported by said member, each substrate having a mosaic pattern of filter segments thereon, whereby said optical filter provides a high percentage of transmission in a narrow band centered about the selected wavelength.
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) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |