Patent US2819673A successfully refreshed from Google Patents.
US2819673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for opening oil-and gas-bearing strata
Assignee: Dow Chemical Co
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Filing: 1953-01-02
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Granted: 1958-01-14
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Expires: 1973-01-02
Abstract
No abstract record available.
Inventors
- 👤 Clyde J Cecil
- 👤 Leo A Courter
- 👤 Clarence R Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:15
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B43/117
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
179 words
A WELL WALL PIERCING APPARATUS FOR WELLS DRILLED INTO THE EARTH COMPRISING A PLURALITY OF INDIVIDUAL FRANGIBLE ENCLOSURES EACH ADAPTED TO ENCLOSE A SHAPED DETONABLE EXPLOSIVE CHARGE HAVING A SINGLE FIRING AXIS; A FRANGIBLE ELONGATED CARRIER FOR THE ENCLOSURES COMPRISING THREE TUBULAR MEMBERS ADAPTED TO BE LOWERED ENDWISE INTO THE WELL BORE, SAID FRANGIBLE ENCLOSURES BEING MOUNTED ON THE TUBULAR MEMBERS IN A ROW EXTENDING ALONG THE LONGITUDINAL AXIS OF THE CARRIER, SAID TUBULAR MEMBERS BEING ORIENTED SO THAT THE FIRING AXIS OF THE CHARGE IN EACH FRANGIBLE ENCLOSURE MAKES AN ANGLE OF 20 TO 70 DEGREES WITH THE LONGITUDINAL AXIS OF THE CARRIER; A HOUSING ADAPTED TO ENCLOSE A DETONATOR; MEANS TO SECURE THE UPPER ENDS OF THE TUBULAR MEMBERS TO THE HOUSING, SAID HOUSING HAVING PASSAGEWAYS THEREIN COMMUNICATING WITH THE BORE OF THE TUBULAR MEMBERS; A DETONABLE EXPLOSIVE FUSE MEANS EXTENDING THROUGH THE BORE OF EACH TUBULAR MEMBER INTO THE SAID HOUSING, THE FUSES BEING BOUND TOGETHER AT THEIR UPPER ENDS IN THE HOUSING; A BLASTING CAP IN THE HOUSING ADJACENT TO ONE OF THE EXPLOSIVE FUSE
Claim 2
Dependent Claim
179 words
A WELL WALL PIERCING APPARATUS FOR WELLS DRILLED INTO THE EARTH COMPRISING A PLURALITY OF INDIVIDUAL FRANGIBLE ENCLOSURES EACH ADAPTED TO ENCLOSE A SHAPED DETONABLE EXPLOSIVE CHARGE HAVING A SINGLE FIRING AXIS; A FRANGIBLE ELONGATED CARRIER FOR THE ENCLOSURES COMPRISING THREE TUBULAR MEMBERS ADAPTED TO BE LOWERED ENDWISE INTO THE WELL BORE, SAID FRANGIBLE ENCLOSURES BEING MOUNTED ON THE TUBULAR MEMBERS IN A ROW EXTENDING ALONG THE LONGITUDINAL AXIS OF THE CARRIER, SAID TUBULAR MEMBERS BEING ORIENTED SO THAT THE FIRING AXIS OF THE CHARGE IN EACH FRANGIBLE ENCLOSURE MAKES AN ANGLE OF 20 TO 70 DEGREES WITH THE LONGITUDINAL AXIS OF THE CARRIER; A HOUSING ADAPTED TO ENCLOSE A DETONATOR; MEANS TO SECURE THE UPPER ENDS OF THE TUBULAR MEMBERS TO THE HOUSING, SAID HOUSING HAVING PASSAGEWAYS THEREIN COMMUNICATING WITH THE BORE OF THE TUBULAR MEMBERS; A DETONABLE EXPLOSIVE FUSE MEANS EXTENDING THROUGH THE BORE OF EACH TUBULAR MEMBER INTO THE SAID HOUSING, THE FUSES BEING BOUND TOGETHER AT THEIR UPPER ENDS IN THE HOUSING; A BLASTING CAP IN THE HOUSING ADJACENT TO ONE OF THE EXPLOSIVE FUSE
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |