Patent US2928406A successfully refreshed from Google Patents.
US2928406A
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US
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Solution conductivity measuring and controlling apparatus
Assignee: Industrial Instruments Inc
•
Filing: 1956-06-22
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Granted: 1960-03-15
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Expires: 1976-06-22
Abstract
No abstract record available.
Inventors
- 👤 Leo C Cunniff
- 👤 Rosenthal Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:15
CPC Classifications
G; G05; G05D; G05D21/00; G05D21/02; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0329; Y10T137/034; Y10T137/7722; Y10T137/7758; Y10T137/7761; Y10T137/8593; Y10T137/86389; Y10T137/86405
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1870982A
Cited
US1296250A
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US1530833A
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US1576001A
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US1830333A
Cited
US2221307A
Cited
US2651751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |