US2620385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectrically controlled system for detecting suspended matter in fluids
Assignee: Specialties Development Corp
•
Filing: 1949-11-30
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Granted: 1952-12-02
•
Expires: 1969-11-30
Abstract
No abstract record available.
Inventors
- 👤 Jr Harry C Grant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:12
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/10; G08B17/103; G08B17/11; G08B17/113
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1324732A
Cited
US1115419A
Cited
US1772671A
Cited
US2052057A
Cited
US2362021A
Cited
US2444065A
Cited
US2509497A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |