US3238973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing underground conduits
Assignee: West Chester Chemical Co Inc
•
Filing: 1961-02-07
•
Granted: 1966-03-08
•
Expires: 1981-02-07
Abstract
No abstract record available.
Inventors
- 👤 Roach Robert Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:45
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/16; F16L55/168; F16L55/175
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
74 words
THE METHOD OF SEALING AN UNDERGROUND CONDUIT WHICH COMPRISES THE STEPS OF EXCAVATING A VERTICAL BORE FROM THE GROUND SURFACE TO THE CONDUIT AREA TO BE SEALED AND TO EXPOSE SUBSTANTIALLY THE PERIPHERY OF THE CONDUIT IN THE AREA TO BE SEALED, PARTIALLY FILLING SAID BORE WITH A HARDENABLE SEALANT, CLOSING OFF THE UPPER PORTION, OF SAID BORE, INTRODUCING FLUID PRESSURE INTO THE BORE, AND MAINTAINING PRESSURE ON THE SEALANT UNTIL IT HAS HARDENED.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |