US3206537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically conductive conduit
Assignee: Schlumberger Well Surveying Corp
•
Filing: 1960-12-29
•
Granted: 1965-09-14
•
Expires: 1980-12-29
Abstract
No abstract record available.
Inventors
- 👤 Wendell B Steward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:08
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/04; H01B7/046; E; E21; E21B; E21B17/00; E21B17/003; F; F16; F16L; F16L25/00; F16L25/01; H01B1/00; Y; Y10; Y10S; Y10S285/00; Y10S285/915
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
A CASING FOR A WELL COMPRISING AT LEAST ONE SECTION FORMED OF A HARDENED PLASTIC MATERIAL INCORPORATING CARBON BLACK AND IRON FILINGS AND SURROUNDED BY A CEMENT COMPRISING PORTLAND CEMENT, AGGREGATE, CARBON BLACK AND IRON FILLINGS.
Claim 2
Dependent Claim
36 words
A CASING FOR A WELL COMPRISING AT LEAST ONE SECTION FORMED OF A HARDENED PLASTIC MATERIAL INCORPORATING CARBON BLACK AND IRON FILINGS AND SURROUNDED BY A CEMENT COMPRISING PORTLAND CEMENT, AGGREGATE, CARBON BLACK AND IRON FILLINGS.
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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) | 1968-09-13 | 1969-03-15 | 1969-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-13 | 1973-03-15 | 1973-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-13 | 1977-03-15 | 1977-09-14 | $7700.00 | Window Closed / Lapsed |