US3203736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic method of mining coal and the like
Assignee: Individual
•
Filing: 1961-12-12
•
Granted: 1965-08-31
•
Expires: 1981-12-12
Abstract
No abstract record available.
Inventors
- 👤 James A Andersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:06
CPC Classifications
E; E21; E21C; E21C25/00; E21C25/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
THE METHOD OF MINING COAL OR THE LIKE COMPRISING DIRECTING A HYDRAULIC JET OF NOT GREATER THAN ON-FOURTH INCH IN DIAMETER AT ITS POINT OF ORIGIN TO ITS POINT OF CONTACT AND DISCHARGED UNDER A PRESSURE OF NET LESS THAN 2000 POUNDS PER SQUARE INCH AGAINST THE VEIN OF COAL AND PROGRESSIVELY MOVING THE JET AND SO DIFECTING IT SO AS TO CUT A PLURALITY OF CHANNELS THEREIN IN SPACED RELATIONSHIP AND TO
Claim 2
Independent Claim
73 words
THE METHOD OF MINING COAL OR THE LIKE COMPRISING DIRECTING A HYDRAULIC JET OF NOT GREATER THAN ON-FOURTH INCH IN DIAMETER AT ITS POINT OF ORIGIN TO ITS POINT OF CONTACT AND DISCHARGED UNDER A PRESSURE OF NET LESS THAN 2000 POUNDS PER SQUARE INCH AGAINST THE VEIN OF COAL AND PROGRESSIVELY MOVING THE JET AND SO DIFECTING IT SO AS TO CUT A PLURALITY OF CHANNELS THEREIN IN SPACED RELATIONSHIP AND TO
References Cited (Backward Citations)
FR773344A
Cited
US2148495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |