US3960754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-wavelength optical filter
Assignee: American Optical Corp
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Filing: 1974-08-01
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Granted: 1976-06-01
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Expires: 1994-08-01
Abstract
Abstract A multi-wavelength optical filter, particularly useful for shielding against laser light, includes compounds incorporated into a glass base which produce Cu2<+> ions, Er3<+> ions, and Ce3<+> ions, thereby providing a filter having desired optical densities at 488 nm, 515 nm, 530 nm, 671 nm, 694 nm, 1060 nm, 840-900 nm, 347 nm, and 337 nm.
Inventors
- 👤 Richard Forrest Woodcock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:03
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/10; C03C4/00; C03C4/08; Y; Y10; Y10S; Y10S501/00; Y10S501/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
82 words
A multi-wavelength optical filter for protection against laser radiation comprising at least one base glass composition, all percentages on an oxide basis, containing from 0.1-5 weight percent of a compound producing Ce.sup. 3 + ions, 25-75 weight percent of a compound producing Er 3 + ions and 0.5-10 weight percent of a compound producing Cu 2 + ions, said compounds being soluble in at least a melt of a base glass composition so as to be uniformly distributed throughout the base composition.
Claim 2
Dependent Claim
82 words
A multi-wavelength optical filter for protection against laser radiation comprising at least one base glass composition, all percentages on an oxide basis, containing from 0.1-5 weight percent of a compound producing Ce.sup. 3 + ions, 25-75 weight percent of a compound producing Er 3 + ions and 0.5-10 weight percent of a compound producing Cu 2 + ions, said compounds being soluble in at least a melt of a base glass composition so as to be uniformly distributed throughout the base composition.
Claim 3
Dependent Claim
16 words
A multi-wavelength optical filter according to claim 1 wherein said base glass is a phosphate glass.
Claim 4
Dependent Claim
15 words
A multi-wavelength optical filter according to claim 1 wherein said cation producing compounds are oxides.
Claim 5
Dependent Claim
36 words
A multi-wavelength optical filter according to claim 3 wherein 50 weight percent of Er 2 O 3 , 0.3 weight percent of CeO 2 and 4 weight percent of CuO are present in said base glass.
Claim 6
Dependent Claim
23 words
A multi-wavelength optical filter according to claim 4 wherein all said compounds are incorporated in a single base glass of the phosphate type.
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) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |