US3077936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diamond drill
Assignee: Individual
•
Filing: 1961-11-06
•
Granted: 1963-02-19
•
Expires: 1981-11-06
Abstract
No abstract record available.
Inventors
- 👤 Arutunoff Armais
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:57
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/48; E21B10/02; E21B10/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
IN COMBINATION, AN ANNULAR MAIN BIT AND A SEPARATELY DRIVEN SUPPLEMENTAL BIT LOCATED WITHIN THE CONFINES OF SAID MAIN BIT, THE ANNULAR CUTTING SURFACE OF SAID MAIN BIT ADJACENT SAID SUPPLEMENTAL BIT BEING INWARDLY STEP-SHAPED TO AT LEAST PARTIALLY OVERLIE SAID SUPPLEMENTAL BIT, WHEREBY SAID MAIN BIT FIRST FORMS A CORE IN THE UPPER SURFACE OF WHICH A CUP-SHAPED DEPRESSION IS FORMED BY SAID SUPPLE-
Claim 2
Dependent Claim
65 words
IN COMBINATION, AN ANNULAR MAIN BIT AND A SEPARATELY DRIVEN SUPPLEMENTAL BIT LOCATED WITHIN THE CONFINES OF SAID MAIN BIT, THE ANNULAR CUTTING SURFACE OF SAID MAIN BIT ADJACENT SAID SUPPLEMENTAL BIT BEING INWARDLY STEP-SHAPED TO AT LEAST PARTIALLY OVERLIE SAID SUPPLEMENTAL BIT, WHEREBY SAID MAIN BIT FIRST FORMS A CORE IN THE UPPER SURFACE OF WHICH A CUP-SHAPED DEPRESSION IS FORMED BY SAID SUPPLE-
References Cited (Backward Citations)
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-02-18 | 1966-08-20 | 1967-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-18 | 1970-08-20 | 1971-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-18 | 1974-08-20 | 1975-02-19 | $7700.00 | Window Closed / Lapsed |