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Patent US3511324A successfully refreshed from Google Patents.
US3511324A
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US
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Method and sampler for taking an undisturbed soil sample
Assignee: STICHTING WATERBOUWKUNDIG LAB
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Filing: 1966-04-12
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Granted: 1970-05-12
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Expires: 1986-04-12
Abstract
No abstract record available.
Inventors
- 👤 Herman Pieters
- 👤 Heinrich K S P Begemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:35
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2602959A
Cited
FR1107204A
Cited
US2879803A
Cited
US2927775A
Cited
US2927776A
Cited
US3157544A
Cited
US3312568A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-11 | 1973-11-10 | 1974-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-11 | 1977-11-10 | 1978-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-11 | 1981-11-10 | 1982-05-12 | $7700.00 | Window Closed / Lapsed |