Patent US3244426A successfully refreshed from Google Patents.
US3244426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Percussion drills
Assignee: Uddeholms AB
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Filing: 1962-03-05
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Granted: 1966-04-05
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Expires: 1982-03-05
Abstract
No abstract record available.
Inventors
- 👤 Skoglund Karl Waldemar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:08
CPC Classifications
B; B25; B25D; B25D17/00; B25D17/06; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17042; Y10T279/17957; Y10T279/17965
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
IN COMBINATION, A PERCUSSION DRILL ROD AND A CHUCK, SAID DRILL ROD COMPRISING A SHANK OF GENERALLY POLYGONAL CROSS-SECTION AND A COLLAR HAVING AN ANNULAR IMPACT SURFACE EXTENDING AROUND SAID DRILL ROD, SAID ANNULAR IMPACT SURFACE BEING ON THE SIDE OF SAID COLLAR TOWARD SAID SHANK, SAID CHUCK SURROUNDING SAID SHANK AND BEING MOVABLE RELATIVE THERETO ALONG THE LONGITUDINAL DIRECTION OF SAID DRILL ROD, SAID CHUCK HAVING AN ANNULAR IMPACT SURFACE COOPERATING WITH THE ANNULAR IMPACT SURFACE ON SAID COLLAR, SAID CHUCK HAVING A POLYGONAL OPENING THEREIN FOR COOPERATING WITH THE SHANK, SAID SHANK AND CHUCK HAVING MUTUALLY CORRESPONDING CONICAL PORTIONS WITH ROUND CROSSSECTIONS AND ACUTE CONE ANGLES, THE BASES OF SAID CONICAL PORTIONS BEING ADJACENT THE RESPECTIVE ANNULAR IMPACT SURFAES AND HAVING A DIAMETER WHICH IS GREATER THAN THE GREATEST DIAMETER OF THE POLYOGNAL CROSS-SECTION OF SAID SHANK, THE CONICAL PORTION OF SAID DRILL ROD BEING CONNECTED TO THE IMPACT SURFACE OF SAID COLLAR BY A CONCAVE FILLET, SAID CONICAL PORTION OF THE DRILL ROD HAVING A SUBSTANTIALLY GREATER AXIAL LENGTH THAN THE AXIAL LENGTH OF SAID CONCAVE FILLET.
Claim 2
Dependent Claim
180 words
IN COMBINATION, A PERCUSSION DRILL ROD AND A CHUCK, SAID DRILL ROD COMPRISING A SHANK OF GENERALLY POLYGONAL CROSS-SECTION AND A COLLAR HAVING AN ANNULAR IMPACT SURFACE EXTENDING AROUND SAID DRILL ROD, SAID ANNULAR IMPACT SURFACE BEING ON THE SIDE OF SAID COLLAR TOWARD SAID SHANK, SAID CHUCK SURROUNDING SAID SHANK AND BEING MOVABLE RELATIVE THERETO ALONG THE LONGITUDINAL DIRECTION OF SAID DRILL ROD, SAID CHUCK HAVING AN ANNULAR IMPACT SURFACE COOPERATING WITH THE ANNULAR IMPACT SURFACE ON SAID COLLAR, SAID CHUCK HAVING A POLYGONAL OPENING THEREIN FOR COOPERATING WITH THE SHANK, SAID SHANK AND CHUCK HAVING MUTUALLY CORRESPONDING CONICAL PORTIONS WITH ROUND CROSSSECTIONS AND ACUTE CONE ANGLES, THE BASES OF SAID CONICAL PORTIONS BEING ADJACENT THE RESPECTIVE ANNULAR IMPACT SURFAES AND HAVING A DIAMETER WHICH IS GREATER THAN THE GREATEST DIAMETER OF THE POLYOGNAL CROSS-SECTION OF SAID SHANK, THE CONICAL PORTION OF SAID DRILL ROD BEING CONNECTED TO THE IMPACT SURFACE OF SAID COLLAR BY A CONCAVE FILLET, SAID CONICAL PORTION OF THE DRILL ROD HAVING A SUBSTANTIALLY GREATER AXIAL LENGTH THAN THE AXIAL LENGTH OF SAID CONCAVE FILLET.
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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) | 1969-04-04 | 1969-10-04 | 1970-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-04 | 1973-10-04 | 1974-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-04 | 1977-10-04 | 1978-04-05 | $7700.00 | Window Closed / Lapsed |