US3572839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for excavation of hard underwater beds
Assignee: Toa Corp
•
Filing: 1968-08-28
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Granted: 1971-03-30
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Expires: 1988-08-28
Abstract
Abstract A process for excavating hard underwater beds characterized in that compressed air is ejected around jets of high pressure water so as to blow off existing water from the peripheries of said water jets thereby to enhance the excavating efficiency of said hydraulical jets.
Inventors
- 👤 Saburo Okabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:18
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/88; E02F3/90; E02F3/92; E02F3/9206; E02F3/9212
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
51 words
A process for excavating hard underwater beds characterized in that compressed air is ejected within a body of water around jets of high pressure water so as to blow water from and form A tubular air space around the water jets thereby to enhance the excavating efficiency of the water jets.
Claim 2
Dependent Claim
51 words
A process for excavating hard underwater beds characterized in that compressed air is ejected within a body of water around jets of high pressure water so as to blow water from and form A tubular air space around the water jets thereby to enhance the excavating efficiency of the water jets.
Claim 3
Dependent Claim
86 words
A process for excavating hard underwater beds according to claim 1 characterized in that the front end of a penstock is branched sidewise and forms tapered nozzles, each nozzle being surrounded by a tapered front end of compressed air pipe with a suitable gap provided therebetween, and high pressure water is jetted out of said nozzles of penstock while compressed air is jetted out of the tapered ends of branched compressed air pipes through said gap into the spaces around said jets of high pressure water.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |