Patent US3589814A successfully refreshed from Google Patents.
US3589814A
Expired / Lapsed
US
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Rotating cell spectrophotometer
Assignee: ARTHUR H THOMAS CO
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Filing: 1969-12-01
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Granted: 1971-06-29
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Expires: 1989-12-01
Abstract
Abstract A spectrophotometer uses a single beam of light into which the sample cell and reference cell are alternately rotated. The radiation-sensing circuit includes means to automatically compensate to read 100 percent transmission.
Inventors
- 👤 Edward B Patterson
- 👤 James L Manniso
- 👤 Robert F Dalton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:05
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/27; G01N21/274; G01N21/276; G01N21/01; G01N21/03
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
123 words
In a spectrophotometer in accordance with claim 1 wherein said switch means includes means for connecting said radiation-sensing means to a measuring means through said second bulbous portion and said second brush means when said sample cell is aligned with said optical path, said switch means including means for connecting said radiation-sensing means to a control means through said second bulbous portion and said third brush means for controlling the sensitivity of said radiation-sensing means when said reference cell is aligned with said optical path, said control means including means for maintaining said radiation-sensing means at a predetermined sensitivity, said means for maintaining said radiation-sensing mEans at a predetermined sensitivity including a bridge circuit for comparing a preset value with an instantaneous value.
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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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |