US3285355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Large diameter well-drilling bit
Assignee: Smith Industries International Inc
•
Filing: 1964-02-17
•
Granted: 1966-11-15
•
Expires: 1984-02-17
Abstract
No abstract record available.
Inventors
- 👤 William J Neilson
- 👤 Robert L Dixon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:32
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/26; E21B10/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A LARGE DIAMETER DRILLING BIT HAVING A PLURALITY OF STAGES, ROLLER CUTTERS ROTATABLY MOUNTED ON EACH STAGE ARRANGED SO THAT THE CUTTERS ON THE SUCCESSIVE STAGES CUT ON ANNULI OF PROGRESSIVELY INCREASING DIAMETERS, AND WEIGHT CONTAINER MEANS INTERPOSED BETWEEN TWO OR MORE STAGES AND DETACHABLY CONNECTING ADJACENT STAGES TO EACH OTHER.
Claim 2
Dependent Claim
51 words
A LARGE DIAMETER DRILLING BIT HAVING A PLURALITY OF STAGES, ROLLER CUTTERS ROTATABLY MOUNTED ON EACH STAGE ARRANGED SO THAT THE CUTTERS ON THE SUCCESSIVE STAGES CUT ON ANNULI OF PROGRESSIVELY INCREASING DIAMETERS, AND WEIGHT CONTAINER MEANS INTERPOSED BETWEEN TWO OR MORE STAGES AND DETACHABLY CONNECTING ADJACENT STAGES TO EACH OTHER.
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) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |