US3685885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation attenuating comb assembly
Assignee: Beckman Instruments Ltd
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Filing: 1970-10-02
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Granted: 1972-08-22
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Expires: 1990-10-02
Abstract
Abstract There is disclosed a beam-attenuation comb assembly for doublebeam, optical null spectrophotometers comprising a major and minor comb adapted for mutual registration. The major comb has a single wedge shaped aperture and the minor comb a pair of similarly shaped apertures. In operation the assembly is driven in the manner well known in the art. Upon actuation of a solenoid, the major and minor comb assembly is disengaged and only the minor comb is driven to achieve beam balancing. Since the change in attenuation per unit displacement of the minor comb is different than that for the major and minor comb assembly, a scale expansion is achieved.
Inventors
- 👤 William Anthony Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:03
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/10; G01J1/20; G01J1/22; G01J1/24
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
132 words
Apparatus for use in a spectrophotometer comprising: first and second aperture members adapted for mutual registration and mutual translational movement in each direction from a datum position to provide a beam-attenuation comb assembly for increasing and decreasing the intensity of a beam transmitted thereby; releasable locking means securing said first and second aperture members one to the other for mutual translational movement; drive means connected to one of said members for translating said members in either direction thereby to provide a first predetermined attenuation characteristic when said members are secured together for mutual translational movement; and means for actuating said releasable locking means to disengage said first and second members one from the other whereby only the driven member is translated by said drive means to provide a second predetermined attenuation characteristic.
Claim 2
Dependent Claim
132 words
Apparatus for use in a spectrophotometer comprising: first and second aperture members adapted for mutual registration and mutual translational movement in each direction from a datum position to provide a beam-attenuation comb assembly for increasing and decreasing the intensity of a beam transmitted thereby; releasable locking means securing said first and second aperture members one to the other for mutual translational movement; drive means connected to one of said members for translating said members in either direction thereby to provide a first predetermined attenuation characteristic when said members are secured together for mutual translational movement; and means for actuating said releasable locking means to disengage said first and second members one from the other whereby only the driven member is translated by said drive means to provide a second predetermined attenuation characteristic.
Claim 3
Dependent Claim
36 words
The apparatus according to claim 1 wherein one of said members has a pair of similar wedge-shaped apertures therein and the other has a wedge-shaped aperture of corresponding dimensions to the apertures of said one member.
References Cited (Backward Citations)
US1849607A
Cited
US2896508A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |