Patent US3255833A successfully refreshed from Google Patents.
US3255833A
Expired / Lapsed
US
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Drill bit auxiliary
Assignee: Texaco Development Corp
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Filing: 1963-10-10
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Granted: 1966-06-14
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Expires: 1983-10-10
Abstract
No abstract record available.
Inventors
- 👤 Paul F Kerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:24
CPC Classifications
E; E21; E21B; E21B27/00; E21B27/02; E21B33/00; E21B33/10; E21B33/13; E21B33/138
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
IN ROTARY WELL DRILLING APPARATUS INCLUDING A BIT AND A STEM THEREFOR, A DRILL BIT AUXILIARY ADAPTED FOR APPLYING PASTE TO FORM A CAVITY SEALING WALL COMPRISING TUBE MEANS SURROUNDING THE STEM OF SAID BIT FOR CONTAINING SAID PASTE AND HAVING A CLOSEABLE OPENING FOR EXTRUDING SAID PASTE, AND MEANS ASSOCIATED WITH SAID BIT FOR HOLDING SAID OPENING CLOSED SO LONG AS FORMATION IS BEING ENCOUNTERED BY THE BIT.
Claim 2
Dependent Claim
69 words
IN ROTARY WELL DRILLING APPARATUS INCLUDING A BIT AND A STEM THEREFOR, A DRILL BIT AUXILIARY ADAPTED FOR APPLYING PASTE TO FORM A CAVITY SEALING WALL COMPRISING TUBE MEANS SURROUNDING THE STEM OF SAID BIT FOR CONTAINING SAID PASTE AND HAVING A CLOSEABLE OPENING FOR EXTRUDING SAID PASTE, AND MEANS ASSOCIATED WITH SAID BIT FOR HOLDING SAID OPENING CLOSED SO LONG AS FORMATION IS BEING ENCOUNTERED BY THE BIT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |