US3559409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for constructing a lined underground cavity by underreaming, grouting, and boring through the grouting
Assignee: United States Atomic Energy Commission
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Filing: 1969-06-24
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Granted: 1971-02-02
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Expires: 1989-06-24
Abstract
Abstract DRILLING A BOREHOLE, LOCATING A CASING IN THE BOREHOLE, FILLING THE SPACE BETWEEN THE CASING AND THE BOREHOLE WITH GROUT, UNDERREAMING A LARGE BOREHOLE BENEATH THE GROUT, UNDERREAMING THE LARGE BOREHOLE, FILLING THE LARGE UNDERREAMED BOREHOLE WITH ADDITIONAL GROUT THAT BINDS WITH THE PREVIOUSLY UNDERREAMED GROUT, DRILLING A SMALL BOREHOLE FROM THE CASING INTO THE ADDED GROUT, AND UNDERREAMING THE SMALL BOREHOLE BUT LEAVING A WALL OF GROUT TO FORM A LINED CAVITY.
Inventors
- 👤 Walter H Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:52
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |