Patent US3574553A successfully refreshed from Google Patents.
US3574553A
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US
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Fluid analyzer
Assignee: Howard Precision Inc
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Filing: 1968-01-08
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Granted: 1971-04-13
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Expires: 1988-01-08
Abstract
Abstract A FLUID ANALYZER WHICH PERIODICALLY, AUTOMATICALLY MIXES A FLUID SAMPLE WITH A TEST REAGENT, ANALYZES ALTERATIONS IN LIGHT TRANSMISSION CHARACTERISTICS OF THE MIXTURE PRODUCED THEREBY BY MENAS OF A PHOTO-SENSITIVE, SIGNAL GENERATING SENSOR WHICH FEEDS AND CONTROLS RESPONSE MEANS SUCH AS A MAKE-UP CHEMICAL FEEDER, AN ALARM OR A RECORDER, AND AUTOMATICALLY CLEANSES THE OPTICAL SURFACES.
Inventors
- 👤 Herbert Weitz
- 👤 Roderic Spencer
- 👤 Fred Reh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:18
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/01; G01N21/15; G01N35/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |