Earth working – Processes
Patent
1988-12-16
1990-12-04
Johnson, Richard J.
Earth working
Processes
172657, 172699, 172196, 172413, A01B 1310, A01B 3916
Patent
active
049746812
ABSTRACT:
A method for fracturing below ground hardpan which includes entering a sub-soil tine beneath the lower surface of a layer of hardpan, with the upper surface angle of the tine in range of orientation which provides an improved fracturing width.
REFERENCES:
patent: 3002574 (1961-10-01), Padrick
patent: 3024851 (1962-03-01), Harres
patent: 3120281 (1964-02-01), Peveler
patent: 3578090 (1971-05-01), Cline
patent: 3584692 (1971-06-01), Fasse
patent: 4269274 (1981-05-01), Robertson
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