Patent US3215443A successfully refreshed from Google Patents.
US3215443A
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US
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Percussion rock drilling machines
Assignee: Rand Mines Ltd
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Filing: 1962-12-03
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Granted: 1965-11-02
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Expires: 1982-12-03
Abstract
No abstract record available.
Inventors
- 👤 Cecil J Irving
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:56
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/02; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17111
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
IN COMBINATION WITH A PERCUSSIVE ROCK DRILLING MACHINE, A MACHINE CHUCK, AN AUXILIARY CHUCK HELD IN THE MACHINE CHUCK, A BORE IN THE SAID AUXILIARY CHUCK, A SHANK PORTION OF A DRILL STEEL ENGAGED IN THE SAID BORE, A LONGITUDINALLY EXTENDING WATER PASSAGEWAY BETWEEN SAID BORE AND THE SAID SHANK PORTION, AN EXTERNAL ATER BOX ASSOCIATED WITH THE AUXILIARY CHUCK, A BLANKED-OFF INNER
Claim 2
Dependent Claim
63 words
IN COMBINATION WITH A PERCUSSIVE ROCK DRILLING MACHINE, A MACHINE CHUCK, AN AUXILIARY CHUCK HELD IN THE MACHINE CHUCK, A BORE IN THE SAID AUXILIARY CHUCK, A SHANK PORTION OF A DRILL STEEL ENGAGED IN THE SAID BORE, A LONGITUDINALLY EXTENDING WATER PASSAGEWAY BETWEEN SAID BORE AND THE SAID SHANK PORTION, AN EXTERNAL ATER BOX ASSOCIATED WITH THE AUXILIARY CHUCK, A BLANKED-OFF INNER
References Cited (Backward Citations)
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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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |