Patent US4657398A successfully refreshed from Google Patents.
US4657398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simultaneous multiple wavelength photometer
Assignee: Bayer Corp
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Filing: 1985-06-10
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Granted: 1987-04-14
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Expires: 2005-06-10
Abstract
Abstract Simultaneous multiple photometer measurements are made by simultaneously passing light to be measured through multiple light paths to different locations of a circularly variable filter; passing the light through the circularly variable filter at said locations; collecting the light passed through the circularly variable filter at each location; transmitting the light passed through the circularly variable filter to separate detectors; and measuring the light transmitted along each light path by said detectors.
Inventors
- 👤 Albert Brunsting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:23
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/31; G01J; G01J3/00; G01J3/12; G01J3/28; G01J3/30; G01J3/32; G01J2003/1226; G01J2003/1234; G01J3/02; G01J3/0294; G01N21/47; G01N21/4738; G01N21/59
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
122 words
Apparatus for simultaneously measuring light at multiple wavelengths which are at least 50 nanometers apart and within the range of 400 to 700 nanometers comprising: a circularly variable filter; means for passing the light along multiple light transmission paths to the circularly variable filter; means for passing said light through the circularly variable filter at at least two separate positions of the circularly variable filter which are at wavelengths 50 nanometers apart and within the range of 400 to 700 nanometers; separate detection means for measuring each wavelength of the light passed through the circularly variable filter; and means for simultaneously moving the means for passing light through the circularly variable filter and the detection means relative to said circularly variable filter.
Claim 2
Dependent Claim
122 words
Apparatus for simultaneously measuring light at multiple wavelengths which are at least 50 nanometers apart and within the range of 400 to 700 nanometers comprising: a circularly variable filter; means for passing the light along multiple light transmission paths to the circularly variable filter; means for passing said light through the circularly variable filter at at least two separate positions of the circularly variable filter which are at wavelengths 50 nanometers apart and within the range of 400 to 700 nanometers; separate detection means for measuring each wavelength of the light passed through the circularly variable filter; and means for simultaneously moving the means for passing light through the circularly variable filter and the detection means relative to said circularly variable filter.
Claim 3
Dependent Claim
45 words
The apparatus of claim 1 wherein the means for simultaneously moving the means for passing light through the circularly variable filter and the detection means relative to said circularly variable filter is a U-shaped arm interconnected to the central axis of the circularly variable filter.
Claim 4
Dependent Claim
128 words
Apparatus for simultaneously measuring light at multiple wavelengths which are at least 50 nanometers apart and within the range of 400 to 700 nanometers comprising a housing containing: a circularly variable filter; means for passing the light along multiple light transmission paths to the circularly variable filter; means for passing said light through the circularly variable filter at at least two separate positions of the circularly variable filter at wavelengths at least 50 nanometers apart and within the range of 400 to 700 nanometers; separate detection means for measuring each wavelength of light passed through the circularly variable filter; and means attached to the housing for simultaneously moving the means for passing light through the circularly variable filter and the detection means relative to said circularly variable filter.
Claim 5
Dependent Claim
128 words
Apparatus for simultaneously measuring light at multiple wavelengths which are at least 50 nanometers apart and within the range of 400 to 700 nanometers comprising a housing containing: a circularly variable filter; means for passing the light along multiple light transmission paths to the circularly variable filter; means for passing said light through the circularly variable filter at at least two separate positions of the circularly variable filter at wavelengths at least 50 nanometers apart and within the range of 400 to 700 nanometers; separate detection means for measuring each wavelength of light passed through the circularly variable filter; and means attached to the housing for simultaneously moving the means for passing light through the circularly variable filter and the detection means relative to said circularly variable filter.
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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) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |