Patent US3468129A successfully refreshed from Google Patents.
US3468129A
Expired / Lapsed
US
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Method of sealing underground cavities
Assignee: ConocoPhillips Co
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Filing: 1966-07-21
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Granted: 1969-09-23
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Expires: 1986-07-21
Abstract
No abstract record available.
Inventors
- 👤 Carroll F Knutson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:58
CPC Classifications
E; E02; E02D; E02D19/00; E02D19/06; E02D19/12; E02D19/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR322858A
Cited
US849043A
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US2053285A
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US3175614A
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GB958745A
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US3207218A
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US3152640A
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US3221505A
Cited
US3306354A
Cited
US3342261A
Cited
US3330352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-22 | 1973-03-24 | 1973-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-22 | 1977-03-24 | 1977-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-22 | 1981-03-24 | 1981-09-23 | $7700.00 | Window Closed / Lapsed |