US2551874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method comprising coating a welldrilling weighting material
Assignee: Graphite Frecs Co
•
Filing: 1946-02-27
•
Granted: 1951-05-08
•
Expires: 1966-02-27
Abstract
No abstract record available.
Inventors
- 👤 Cerf Baruch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:58
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/03; C09K8/032; Y; Y10; Y10S; Y10S507/00; Y10S507/904
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1575945A
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US1692996A
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US1960899A
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US2059983A
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US2055666A
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US2216769A
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US2329878A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |