Patent US1819722A successfully refreshed from Google Patents.
US3440518A
Expired / Lapsed
US
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Voltage-to-current converter for use with measuring instruments
Assignee: Beckman Coulter Inc
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Filing: 1966-10-24
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Granted: 1969-04-22
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Expires: 1986-10-24
Abstract
No abstract record available.
Inventors
- 👤 Arnie L Cliffgard
- 👤 David G Boynton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:50
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N21/00; G01N21/17; G01N21/25; G01N21/27; G01R; G01R19/00; G01R19/0023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3370222A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-21 | 1972-10-21 | 1973-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-21 | 1976-10-21 | 1977-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-21 | 1980-10-21 | 1981-04-22 | $7700.00 | Window Closed / Lapsed |