Patent US3064436A successfully refreshed from Google Patents.
US3064436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing underground cavities
Assignee: Individual
•
Filing: 1955-10-27
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Granted: 1962-11-20
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Expires: 1975-10-27
Abstract
No abstract record available.
Inventors
- 👤 Robert L Loofbourow
- 👤 Washington D Lacabanne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:24
CPC Classifications
E; E02; E02D; E02D19/00; E02D19/06; E02D19/12; E02D19/20; B; B65; B65G; B65G5/00; E02D19/16; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/138; E21F; E21F17/00; E21F17/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2734861A
Cited
US900683A
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DE380746C
Cited
US1850700A
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US2661062A
Cited
US2728395A
Cited
US2803114A
Cited
US2720390A
Cited
US2869642A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-11-19 | 1966-05-21 | 1966-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-19 | 1970-05-21 | 1970-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-19 | 1974-05-21 | 1974-11-20 | $7700.00 | Window Closed / Lapsed |