Patent US4238828A successfully refreshed from Google Patents.
Patent US3078827A successfully refreshed from Google Patents.
US3078827A
Expired / Lapsed
US
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Valving arrangement for rock drills
Assignee: Ingersoll Rand Co
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Filing: 1961-02-27
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Granted: 1963-02-26
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Expires: 1981-02-27
Abstract
No abstract record available.
Inventors
- 👤 Erwin S Oelke
- 👤 Ewald H Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:40
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/06; E21B4/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49909; Y10T29/49911; Y10T29/49938; Y10T29/4994
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
IN A ROCK DRILLING DEVICE COMPRISING A CASING AND A RECIPROCATORY FIRST MEMBER IN SAID CASING, MEANS TO CONDUCT FLUID TO ACTUATE SAID FIRST MEMBER, A SECOND MEMBER EXTENDING INTO SAID CASING POSITIONED TO BE STRUCK BY SAID FIRST MEMBER, SAID FIRST MEMBER PROVIDED WITH AN AXIAL FIRST PASSAGE TO CONDUCT FLUID THERETHROUGH, SAID SECOND MEMBER PROVIDED WITH AN AXIAL SECOND PASSAGE TO RECEIVE FLUID CONDUCTED THROUGH SAID FIRST PASSAGE, AND CONDUIT MEANS RESILIENTLY CONNECTED TO COMMUNICATE WITH AND TO EXTEND FROM THE PASSAGE OF ONE OF SAID MEMBERS POSITIONED AND ADAPTED TO TELESCOPINGLY COMMUNICATE WITH THE PASSAGE OF THE OTHER OF SAID MEMBERS DURING AT LEAST A PART OF EACH STROKE OF THE OTHER OF SAID MEMBERS.
Claim 2
Dependent Claim
118 words
IN A ROCK DRILLING DEVICE COMPRISING A CASING AND A RECIPROCATORY FIRST MEMBER IN SAID CASING, MEANS TO CONDUCT FLUID TO ACTUATE SAID FIRST MEMBER, A SECOND MEMBER EXTENDING INTO SAID CASING POSITIONED TO BE STRUCK BY SAID FIRST MEMBER, SAID FIRST MEMBER PROVIDED WITH AN AXIAL FIRST PASSAGE TO CONDUCT FLUID THERETHROUGH, SAID SECOND MEMBER PROVIDED WITH AN AXIAL SECOND PASSAGE TO RECEIVE FLUID CONDUCTED THROUGH SAID FIRST PASSAGE, AND CONDUIT MEANS RESILIENTLY CONNECTED TO COMMUNICATE WITH AND TO EXTEND FROM THE PASSAGE OF ONE OF SAID MEMBERS POSITIONED AND ADAPTED TO TELESCOPINGLY COMMUNICATE WITH THE PASSAGE OF THE OTHER OF SAID MEMBERS DURING AT LEAST A PART OF EACH STROKE OF THE OTHER OF SAID MEMBERS.
References Cited (Backward Citations)
US1540910A
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US2725214A
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US2859733A
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US2947519A
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US2951467A
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US2979033A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-02-25 | 1966-08-27 | 1967-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-25 | 1970-08-27 | 1971-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-25 | 1974-08-27 | 1975-02-26 | $7700.00 | Window Closed / Lapsed |