US2644400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit for emergency relief valve of a dredge
Assignee: Individual
•
Filing: 1950-06-24
•
Granted: 1953-07-07
•
Expires: 1970-06-24
Abstract
No abstract record available.
Inventors
- 👤 David L Hofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:41
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/88; E02F3/90; E02F3/907; F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/221; F16K31/00; F16K31/12; F16K31/122; F16K31/1221; F16K31/1223; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7769; Y10T137/8593; Y10T137/86389
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US846897A
Cited
US913180A
Cited
US1493064A
Cited
US1510161A
Cited
US1871163A
Cited
US1999811A
Cited
US2250021A
Cited
US2393201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |