US3195657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Percussion drill
Assignee: Mission Manufacturing Co
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Filing: 1964-06-26
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Granted: 1965-07-20
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Expires: 1984-06-26
Abstract
No abstract record available.
Inventors
- 👤 Samuel L Collier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:22
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/06; E21B4/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
PERCUSSION DRILLING APPARATUS COMPRISING A CASING FORMING A WORKING CHAMBER HAVING A CONNECTION AT ITS REAR END FOR OPERATING FLUID AND AN ANVIL AT ITS FORWARD END, A HAMMER PISTON RECIPROCABLE IN SAID CHAMBER, VALVING MEANS TO ALTERNATELY DIRECT FLUID FROM SAID CONNECTION INTO THE REAR END PORTION OF SAID CHAMBER AWND TO EXHAUST SAID PORTION TO CAUSE SAID PISTON TO BEAT UPON SAID ANVIL, A COMPARTMENT ADJACENT SAID WORKING CHAMBER REAR END PORTION, WALL STRUCTURE SEPARATING SAID COMPARTMENT FROM SAID CHAMBER REAR PORTION, AND A PASSAGE EXTENDING THROUGH SAID WALL STRUCTURE FROM SAID COMPARTMENT TO A PORT IN THE WALL OF SAID CHAMBER REAR PORTION, SAID PORT BEING POSITIONED TO BE TRAVERSED AND CLOSED BY SAID PISTON AS IT APPROACHES TO BE TRAVERSED AND CLOSED BY SAID PISTION, EFFECTIVE COMPRESSION SPACE TO WHICH SAID PISTON IS EXPOSED AND, THEREBY, EXPEDITED THE PISTON TURN AROUND WHILE PROVIDING THE VOLUME OF COMPRESSED WORKING FLUID IN SAID COMPARTMENT TO SUPPLEMENT THE WORKING FLUID APPLIED TO SAID PISTON DURING THE FORWARD STROKE THEREOF.
Claim 2
Dependent Claim
170 words
PERCUSSION DRILLING APPARATUS COMPRISING A CASING FORMING A WORKING CHAMBER HAVING A CONNECTION AT ITS REAR END FOR OPERATING FLUID AND AN ANVIL AT ITS FORWARD END, A HAMMER PISTON RECIPROCABLE IN SAID CHAMBER, VALVING MEANS TO ALTERNATELY DIRECT FLUID FROM SAID CONNECTION INTO THE REAR END PORTION OF SAID CHAMBER AWND TO EXHAUST SAID PORTION TO CAUSE SAID PISTON TO BEAT UPON SAID ANVIL, A COMPARTMENT ADJACENT SAID WORKING CHAMBER REAR END PORTION, WALL STRUCTURE SEPARATING SAID COMPARTMENT FROM SAID CHAMBER REAR PORTION, AND A PASSAGE EXTENDING THROUGH SAID WALL STRUCTURE FROM SAID COMPARTMENT TO A PORT IN THE WALL OF SAID CHAMBER REAR PORTION, SAID PORT BEING POSITIONED TO BE TRAVERSED AND CLOSED BY SAID PISTON AS IT APPROACHES TO BE TRAVERSED AND CLOSED BY SAID PISTION, EFFECTIVE COMPRESSION SPACE TO WHICH SAID PISTON IS EXPOSED AND, THEREBY, EXPEDITED THE PISTON TURN AROUND WHILE PROVIDING THE VOLUME OF COMPRESSED WORKING FLUID IN SAID COMPARTMENT TO SUPPLEMENT THE WORKING FLUID APPLIED TO SAID PISTON DURING THE FORWARD STROKE THEREOF.
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) | 1968-07-19 | 1969-01-18 | 1969-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-19 | 1973-01-18 | 1973-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-19 | 1977-01-18 | 1977-07-20 | $7700.00 | Window Closed / Lapsed |