Patent US6283989B1 successfully refreshed from Google Patents.
US3676007A
Expired / Lapsed
US
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Direct reading filter photometer
Assignee: KIESS INSTRUMENTS Inc
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Filing: 1971-02-09
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Granted: 1972-07-11
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Expires: 1991-02-09
Abstract
Abstract A DIRECT READING FILTER PHOTOMETER FOR CHEMICAL ANALYSIS IS PROVIDED WITH A PLURALITY OF METER SCALES AND PLURALITY OF COLOR FILTERS WITH INTERLOCKING MEANS FOR AUTOMATICALLY SELECTING THE SCALE AND FILTER APPROPRIATE TO THE SPECIFIC ANALYSIS TO BE PERFORMED.
Inventors
- 👤 Raymond W Kiess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:46
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/251; G01N21/253
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |