Patent JPS5966899A successfully refreshed from Google Patents.
US2923355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prevention of casing corrosion
Assignee: California Research LLC
•
Filing: 1957-07-01
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Granted: 1960-02-02
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Expires: 1977-07-01
Abstract
No abstract record available.
Inventors
- 👤 Tadeusz S Arczynski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:56
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/06; Y; Y10; Y10S; Y10S166/00; Y10S166/902
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
IN AN OIL WELL DRILLING PROCESS WHEREIN THE ANNUAL SPACED BETWEEN THE CASING AND THE FORMATION IS FILLED WITH
Claim 2
Dependent Claim
19 words
IN AN OIL WELL DRILLING PROCESS WHEREIN THE ANNUAL SPACED BETWEEN THE CASING AND THE FORMATION IS FILLED WITH
References Cited (Backward Citations)
US2764465A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-01 | 1963-08-03 | 1964-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-01 | 1967-08-03 | 1968-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-01 | 1971-08-03 | 1972-02-02 | $7700.00 | Window Closed / Lapsed |