US3515230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heavy duty soil sampler
Assignee: Sprague and Henwood Inc
•
Filing: 1968-07-09
•
Granted: 1970-06-02
•
Expires: 1988-07-09
Abstract
No abstract record available.
Inventors
- 👤 Thomas A Tomaine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:54
CPC Classifications
E; E21; E21B; E21B25/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191215907A
Cited
US1845230A
Cited
US2044057A
Cited
US2394832A
Cited
US2795395A
Cited
US3180438A
Cited
US3375891A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |