Patent US1943684A successfully refreshed from Google Patents.
US1943684A
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US
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Method and apparatus for controlling the hydrogen-ion concentration of solutions
Assignee: Individual
•
Filing: 1930-06-07
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Granted: 1934-01-16
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Expires: 1950-06-07
Abstract
No abstract record available.
Inventors
- 👤 Harold S Martin
- 👤 Thomas A Janney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:21
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/75; G01N21/77; G01N21/78; G01N21/80; Y; Y10; Y10T; Y10T436/00; Y10T436/11; Y10T436/115831
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) | 1937-01-15 | 1937-07-17 | 1938-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-01-15 | 1941-07-17 | 1942-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-01-15 | 1945-07-17 | 1946-01-16 | $7700.00 | Window Closed / Lapsed |