US3606470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock sampling
Assignee: National Research Corp
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Filing: 1968-08-06
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Granted: 1971-09-20
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Expires: 1988-08-06
Abstract
Abstract AN APPARATUS FOR SAMPLING ROCK ANDOTHER BRITTLE MATERIALS AND FOR CONTROLLING RESULTANT PARTICLE SIZES. THE DEVICE INCLUDES GRINDING MEANS FOR CUTTING GROOVES IN THE ROCK SURFACE AND TO PROVIDE A GROUPING OF THIN, SHALLOW, PARALLEL RIDGES AND CUTTER MEANS TO REDUCE THESE RIDGES TO A POWDER SPECIMEN. COLLECTION MEANS IS PROVIDED FOR THE POWDER.
Inventors
- 👤 Philip Blum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:47
CPC Classifications
B; B28; B28D; B28D1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |