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US1803269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring the turbidity of liquids
Assignee: Individual
•
Filing: 1929-01-10
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Granted: 1931-04-28
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Expires: 1949-01-10
Abstract
No abstract record available.
Inventors
- 👤 Middendorp Daniel Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:34
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/29
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) | 1934-04-27 | 1934-10-27 | 1935-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-04-27 | 1938-10-27 | 1939-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-04-27 | 1942-10-27 | 1943-04-28 | $7700.00 | Window Closed / Lapsed |