US3237704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact drilling apparatus with continuous flushing
Assignee: Individual
•
Filing: 1960-04-18
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Granted: 1966-03-01
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Expires: 1980-04-18
Abstract
No abstract record available.
Inventors
- 👤 Grospas Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:49
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/06; E21B11/00; E21B11/04; E21B21/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
IMPACT DRILLING APPARATUS FOR BORING A HOLE, COMPRISING AT LEAST TWO SHAFTS EACH HAVING A HOLLOW INTERIOR FOR THE CIRCULATION THERETHROUGH OF A FLUSHING LIQUID, STRUTS CONNECTING SAID SHAFTS TOGETHER IN TANDEM, SAID SHAFTS BEING AXIALLY ALIGNED WITH THE HOLE, A STOP DEVICE FIXED TO THE UPPER END OF ONE OF SAID SHAFTS, A LATCHING HEAD SLIDABLY COUPLED TO SAID ONE SHAFT FOR SLIDING MOVEMENT AXIALLY THEREALONG, BORING BIT MEANS SLIDABLY COUPLED TO SAID OTHER SHAFT FOR MOVEMENT AXIALLY OF BOTH SAID SHAFTS, A COMPRESSION SPRING ON THE OTHER OF SAID SHAFTS, ONE END OF SAID COMPRESSION SPRING BEING IN ENGAGEMENT WITH SAID BORING BIT MEANS, THE OTHER END OF SAID SPRING BEING IN ENGAGEMENT WITH SAID STRUT, A LATCHING SLEEVE ON SAID BORING BIT MEANS, MEANS ON SAID LATCHING HEAD LATCHABLY
Claim 2
Dependent Claim
132 words
IMPACT DRILLING APPARATUS FOR BORING A HOLE, COMPRISING AT LEAST TWO SHAFTS EACH HAVING A HOLLOW INTERIOR FOR THE CIRCULATION THERETHROUGH OF A FLUSHING LIQUID, STRUTS CONNECTING SAID SHAFTS TOGETHER IN TANDEM, SAID SHAFTS BEING AXIALLY ALIGNED WITH THE HOLE, A STOP DEVICE FIXED TO THE UPPER END OF ONE OF SAID SHAFTS, A LATCHING HEAD SLIDABLY COUPLED TO SAID ONE SHAFT FOR SLIDING MOVEMENT AXIALLY THEREALONG, BORING BIT MEANS SLIDABLY COUPLED TO SAID OTHER SHAFT FOR MOVEMENT AXIALLY OF BOTH SAID SHAFTS, A COMPRESSION SPRING ON THE OTHER OF SAID SHAFTS, ONE END OF SAID COMPRESSION SPRING BEING IN ENGAGEMENT WITH SAID BORING BIT MEANS, THE OTHER END OF SAID SPRING BEING IN ENGAGEMENT WITH SAID STRUT, A LATCHING SLEEVE ON SAID BORING BIT MEANS, MEANS ON SAID LATCHING HEAD LATCHABLY
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) | 1969-02-28 | 1969-08-30 | 1970-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-28 | 1973-08-30 | 1974-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-28 | 1977-08-30 | 1978-03-01 | $7700.00 | Window Closed / Lapsed |