Patent US2699540A successfully refreshed from Google Patents.
US2699540A
Expired / Lapsed
US
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Method and apparatus for positioning contact element of penetrometers
Assignee: Atlantic Richfield Co
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Filing: 1952-01-05
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Granted: 1955-01-11
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Expires: 1972-01-05
Abstract
No abstract record available.
Inventors
- 👤 James B Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:24
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/40; G01N3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US494974A
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US1225438A
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DE418850C
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US2053938A
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US2229585A
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US2294831A
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US2429420A
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US2494870A
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US2478668A
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US2455748A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-10 | 1958-07-12 | 1959-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-10 | 1962-07-12 | 1963-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-10 | 1966-07-12 | 1967-01-11 | $7700.00 | Window Closed / Lapsed |