Patent US3386769A successfully refreshed from Google Patents.
US3386769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock-breaking apparatus
Assignee: WHITE PINE COPPER CO
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Filing: 1966-01-07
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Granted: 1968-06-04
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Expires: 1986-01-07
Abstract
No abstract record available.
Inventors
- 👤 Howard A Wilmeth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:25
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/20; E21C27/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A ROCK-BREAKING APPARATUS HAVING A BIT AND TOOTH STRUCTURE ASSEMBLY FOR ENGAGING THE ROCK, THE BIT BEING ARRANGED IN SLIDING RELATION TO THE TOOTH STRUCTURE, A SUPPORTING HOUSING IN WHICH THE BIT AND TOOTH STRUCTURE ASSEMBLY IS SLIDABLY MOUNTED, IMPACTING MEANS FOR CONTINUOUSLY SUBJECTING THE BIT TO RAPIDLY REPEATED IMPACTS, MEANS FOR YIELDINGLY URGING THE BIT AND TOOTH ASSEMBLY TO MOVE FORWARD IN THE SUPPORTING HOUSING, MEANS FOR ADVANCING THE HOUSING TO PLACE THE BIT IN ENGAGEMENT WITH THE ROCK TO BE BROKEN AND CAUSE THE BIT AND TOOTH ASSEMBLY TO MOVE REARWARDLY WITH RESPECT TO THE HOUSING AGAINST THE FORCE OF THE YIELDING URGING MEANS, AND MEANS ACTUATED BY THE SAID MOVEMENT OF THE BIT AND TOOTH ASSEMBLY FOR BRINGING THE IMPACTING MEANS INTO OPERATION.
Claim 2
Dependent Claim
126 words
A ROCK-BREAKING APPARATUS HAVING A BIT AND TOOTH STRUCTURE ASSEMBLY FOR ENGAGING THE ROCK, THE BIT BEING ARRANGED IN SLIDING RELATION TO THE TOOTH STRUCTURE, A SUPPORTING HOUSING IN WHICH THE BIT AND TOOTH STRUCTURE ASSEMBLY IS SLIDABLY MOUNTED, IMPACTING MEANS FOR CONTINUOUSLY SUBJECTING THE BIT TO RAPIDLY REPEATED IMPACTS, MEANS FOR YIELDINGLY URGING THE BIT AND TOOTH ASSEMBLY TO MOVE FORWARD IN THE SUPPORTING HOUSING, MEANS FOR ADVANCING THE HOUSING TO PLACE THE BIT IN ENGAGEMENT WITH THE ROCK TO BE BROKEN AND CAUSE THE BIT AND TOOTH ASSEMBLY TO MOVE REARWARDLY WITH RESPECT TO THE HOUSING AGAINST THE FORCE OF THE YIELDING URGING MEANS, AND MEANS ACTUATED BY THE SAID MOVEMENT OF THE BIT AND TOOTH ASSEMBLY FOR BRINGING THE IMPACTING MEANS INTO OPERATION.
References Cited (Backward Citations)
US2384435A
Cited
US1710887A
Cited
US2228445A
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US2606013A
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US3030715A
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US3305953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-04 | 1971-12-04 | 1972-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-04 | 1975-12-04 | 1976-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-04 | 1979-12-04 | 1980-06-04 | $7700.00 | Window Closed / Lapsed |