US3098641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making holes in the earth
Assignee: Ingersoll Rand Co
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Filing: 1960-11-28
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Granted: 1963-07-23
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Expires: 1980-11-28
Abstract
No abstract record available.
Inventors
- 👤 Ronald C Baldwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:12
CPC Classifications
E; E21; E21D; E21D1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A METHOD OF MAKING A HOLE IN A BED OF ROCK BY FORMING THE BOTTOM OF THE HOLE IN THE SHAPE OF A SPIRAL SURFACE TERMINATING IN A GENERALLY VERICAL FACE, DRILLING A SERIES OF BLASTING BORES AT THE ELEVATED PORTION OF THE SPIRAL SURFACE, PLACING EXPLOSIVES IN SAID BLASTING BORES, DETONATING SAID EXPLOSIVE IN A PREDETERMINED DELAY SEQUENCE SUCH THAT THE EXPLOSIVE ADJACENT SAID VERTICAL FACE ARE FIRST DETONATED, REMOVING A PORTION OF THE ROCK LOOSENED BY SAID EXPLOSION, AND PROCEEDING ALONG A SPIRAL PATH TO FORM THE HOLE.
Claim 2
Independent Claim
90 words
A METHOD OF MAKING A HOLE IN A BED OF ROCK BY FORMING THE BOTTOM OF THE HOLE IN THE SHAPE OF A SPIRAL SURFACE TERMINATING IN A GENERALLY VERICAL FACE, DRILLING A SERIES OF BLASTING BORES AT THE ELEVATED PORTION OF THE SPIRAL SURFACE, PLACING EXPLOSIVES IN SAID BLASTING BORES, DETONATING SAID EXPLOSIVE IN A PREDETERMINED DELAY SEQUENCE SUCH THAT THE EXPLOSIVE ADJACENT SAID VERTICAL FACE ARE FIRST DETONATED, REMOVING A PORTION OF THE ROCK LOOSENED BY SAID EXPLOSION, AND PROCEEDING ALONG A SPIRAL PATH TO FORM THE HOLE.
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) | 1966-07-22 | 1967-01-21 | 1967-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-22 | 1971-01-21 | 1971-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-22 | 1975-01-21 | 1975-07-23 | $7700.00 | Window Closed / Lapsed |