Patent US2422873A successfully refreshed from Google Patents.
US2422873A
Expired / Lapsed
US
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Electrical conductivity cell
Assignee: PHOTOSWITCH Inc
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Filing: 1943-05-19
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Granted: 1947-06-24
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Expires: 1963-05-19
Abstract
No abstract record available.
Inventors
- 👤 William F Wolfner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:28
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/06; G01N27/07; G01N27/045; G01N27/046
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US933015A
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AT73216B
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US1826886A
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DE466530C
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US1870995A
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US1807821A
Cited
US2254399A
Cited
US2254400A
Cited
US2370609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-23 | 1950-12-23 | 1951-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-23 | 1954-12-23 | 1955-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-23 | 1958-12-23 | 1959-06-24 | $7700.00 | Window Closed / Lapsed |