US3072843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasion resistant coating suitable for borehole drilling apparatus
Assignee: Texaco Inc
•
Filing: 1957-08-13
•
Granted: 1963-01-08
•
Expires: 1977-08-13
Abstract
No abstract record available.
Inventors
- 👤 Roy J Clements
- 👤 Roland B Stelzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:52
CPC Classifications
E; E21; E21B; E21B41/00; E21B41/02; E21B17/00; E21B17/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
APPARATUS FOR USE IN AN ELECTRICAL WELL LOGGING SYSTEM COMPRISING AN ELECTRICAL LOGGING ELECTRODE ASSEMBLY COMPRISING A HOLLOW METALLIC PIPE, A LAYER OF INSULATION APPLIED TO THE EXTERNAL SURFACE OF SAID PIPE, SAID LAYER OF INSULATION COMPRISING MULTIPLE LAYERS OF GLASS CLOTH BONDED TOGETHER AND TO SAID PIPE BY A POLYMERIZED EPOXY RESIN MATRIX PREPARED FROM GLYCIDYL POLYETHER INCORPORATING POWDERED SILICON CARBIDE IN RELATIVE PROPORTIONS OF 60 TO 100 PAETS BY WEIGHT SILICON CARBIDE PER 100 PARTS BY WEIGHT EPOXY RESIN, A FIRST ELECTRODE IMBEDDED IN SAID LAYER OR INSULATION AND SPACED FROM SAID PIPE AT A POINT SUBSTANTIALLY MIDWAY BETWEEN THE ENDS OF SAID LAYER OF INSULATION AND A SECOND ELECTRODE IMBEDDED IN SAID LAYER OF INSULATION AND SPACED FROM SAID PIPE BETWEEN SAID FIRST ELECTRODE
Claim 2
Dependent Claim
127 words
APPARATUS FOR USE IN AN ELECTRICAL WELL LOGGING SYSTEM COMPRISING AN ELECTRICAL LOGGING ELECTRODE ASSEMBLY COMPRISING A HOLLOW METALLIC PIPE, A LAYER OF INSULATION APPLIED TO THE EXTERNAL SURFACE OF SAID PIPE, SAID LAYER OF INSULATION COMPRISING MULTIPLE LAYERS OF GLASS CLOTH BONDED TOGETHER AND TO SAID PIPE BY A POLYMERIZED EPOXY RESIN MATRIX PREPARED FROM GLYCIDYL POLYETHER INCORPORATING POWDERED SILICON CARBIDE IN RELATIVE PROPORTIONS OF 60 TO 100 PAETS BY WEIGHT SILICON CARBIDE PER 100 PARTS BY WEIGHT EPOXY RESIN, A FIRST ELECTRODE IMBEDDED IN SAID LAYER OR INSULATION AND SPACED FROM SAID PIPE AT A POINT SUBSTANTIALLY MIDWAY BETWEEN THE ENDS OF SAID LAYER OF INSULATION AND A SECOND ELECTRODE IMBEDDED IN SAID LAYER OF INSULATION AND SPACED FROM SAID PIPE BETWEEN SAID FIRST ELECTRODE
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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) | 1966-01-07 | 1966-07-09 | 1967-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-07 | 1970-07-09 | 1971-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-07 | 1974-07-09 | 1975-01-08 | $7700.00 | Window Closed / Lapsed |