Patent US3945761A successfully refreshed from Google Patents.
US3945761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan disturbing sand at the bottom of a body of water so that it may be pumped up efficiently
Assignee: Individual
•
Filing: 1971-09-02
•
Granted: 1976-03-23
•
Expires: 1991-09-02
Abstract
Abstract A fan for use with pumps for pumping up sand from the bottom of a body of water having certain uniquely shaped vanes around the circumference of a truncated cone.
Inventors
- 👤 Toshinobu Araoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:27
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/18; F04D29/181; E; E02; E02F; E02F3/00; E02F3/04; E02F3/88; E02F3/90; E02F3/92; E02F3/9212; E02F3/9225; E02F3/9293
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A fan for hydraulically disturbing sand at the bottom of a body of water, said fan comprising a central supporting member having a frusto-conical outer surface which is larger at its upper than its lower end and a plurality of vanes attached along their inner edges to said surface, said vanes being circumferentially distributed about said supporting member and extending for a substantially uniform distance from said frustoconical surface throughout their lengths, the lower part of each vane being substantially straight while its upper part is curved toward the direction of rotation of the fan.
Claim 2
Dependent Claim
95 words
A fan for hydraulically disturbing sand at the bottom of a body of water, said fan comprising a central supporting member having a frusto-conical outer surface which is larger at its upper than its lower end and a plurality of vanes attached along their inner edges to said surface, said vanes being circumferentially distributed about said supporting member and extending for a substantially uniform distance from said frustoconical surface throughout their lengths, the lower part of each vane being substantially straight while its upper part is curved toward the direction of rotation of the fan.
References Cited (Backward Citations)
US1316349A
Cited
US725818A
Cited
US1759490A
Cited
US1842537A
Cited
US2352394A
Cited
US2461311A
Cited
US3148464A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |