US3095049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core drilling apparatus
Assignee: Individual
•
Filing: 1962-04-02
•
Granted: 1963-06-25
•
Expires: 1982-04-02
Abstract
No abstract record available.
Inventors
- 👤 Berger Roland Joseph Du
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:36
CPC Classifications
E; E21; E21B; E21B25/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
IN CORE DRILLING APPARATUS, A DRILL STRING ASSEMBLY COMPRISING (A) BARREL MEANS HAVING AN INNER CYLINDRICAL FACE DEFINING A CORE SPACE, (B) MEANS FOR ROTATING SAID BARREL MEANS, (C) A DRILL BIT SECURED TO AN END OF SAID BARREL MEANS TO FORM A CORE, (D) AND A PLURALITY OF FREE RUNNING SPHERICAL BEARINGS FIXED IN POSITION ON SAID BARREL MEANS TO ROTATE THEREWITH,
Claim 2
Dependent Claim
63 words
IN CORE DRILLING APPARATUS, A DRILL STRING ASSEMBLY COMPRISING (A) BARREL MEANS HAVING AN INNER CYLINDRICAL FACE DEFINING A CORE SPACE, (B) MEANS FOR ROTATING SAID BARREL MEANS, (C) A DRILL BIT SECURED TO AN END OF SAID BARREL MEANS TO FORM A CORE, (D) AND A PLURALITY OF FREE RUNNING SPHERICAL BEARINGS FIXED IN POSITION ON SAID BARREL MEANS TO ROTATE THEREWITH,
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) | 1966-06-24 | 1966-12-24 | 1967-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-24 | 1970-12-24 | 1971-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-24 | 1974-12-24 | 1975-06-25 | $7700.00 | Window Closed / Lapsed |