US2979134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core hole testing apparatus
Assignee: Phillips Petroleum Co
•
Filing: 1955-05-20
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Granted: 1961-04-11
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Expires: 1975-05-20
Abstract
No abstract record available.
Inventors
- 👤 Edwin E Reed
- 👤 Carl T Brandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:39
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/08; E21B49/087; E21B49/088; E21B33/00; E21B33/10; E21B33/12; E21B33/124; E21B33/1243
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1168757A
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FR49349E
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US2409674A
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US2609878A
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US2473713A
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US2607425A
Cited
US2652717A
Cited
US2633015A
Cited
US2629446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |