Patent US3285349A successfully refreshed from Google Patents.
US3285349A
Expired / Lapsed
US
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Method and apparatus for vibratory drillings
Assignee: N A HARDIN
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Filing: 1964-06-01
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Granted: 1966-11-15
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Expires: 1984-06-01
Abstract
No abstract record available.
Inventors
- 👤 Clarence W Brandon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:24
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/06; E21B7/064; E21B7/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
A DRILL COMPRISING A HEAD, A PLURALITY OF TOOTHED ROLLER CUTTERS, JOURNALS ON SAID HEAD, AN ECCENTRIC BEARING ROTATABLE ON EACH OF SAID JOURNALS, SAID ROLLER CUTTERS BEING EACH FREELY ROTATABLE UPON ONE OF SAID ECCENTRIC
Claim 2
Dependent Claim
36 words
A DRILL COMPRISING A HEAD, A PLURALITY OF TOOTHED ROLLER CUTTERS, JOURNALS ON SAID HEAD, AN ECCENTRIC BEARING ROTATABLE ON EACH OF SAID JOURNALS, SAID ROLLER CUTTERS BEING EACH FREELY ROTATABLE UPON ONE OF SAID ECCENTRIC
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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) | 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 |