US3331455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core bit
Assignee: Pratt and Whitney Co Inc
•
Filing: 1964-01-29
•
Granted: 1967-07-18
•
Expires: 1984-01-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Chester A Anderson
- 👤 Leo P Cote
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:33
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/04; B23B51/0461; B23B51/0473; B23B51/0002; B23B51/0003; B23B2240/00; B23B2240/08; B23B2251/00; B23B2251/02; B23B2251/50; B23B2260/00; B23B2260/082
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A CORE BIT COMPRISING A RELATIVELY LONG SECTION OF THIN-WALLED CYLINDRICAL TUBING HAVING A SMOOTH OUTER SURFACE, A RELATIVELY SHORT BODY PORTION HAVING A SUBSTANSTIALLY CYLINDRICAL EXTERIOR SURFACE AND DEFINING AT ONE END THEREOF AN INTERNAL SHOULDER RECEIVING AN END OF SAID TUBING IN COAXIAL ALIGMENT THEREWITH, SAID CYLINDRICAL TUBING HAVING A DIAMETER LESS THAN THE DIAMETER OF SAID BODY PORTION SO AS TO PROVIDE CLEARANCE THEREBEHIND, A PLURALITY OF CIRCUMFERENTIALLY SPACED CUTTERS HAVING LEADING EDGES SECURED TO THE OTHER END OF SAID BODY PORTION, THE EXTERIOR SURFACE OF SAID BODY PORTION HAVING DEFINED THEREIN A PLURALITY OF SPIRAL FLUTES EXTENDING THE ENTIRE LENGTH OF SAID BODY PORTION AND PROVIDING COMMUNICATION BETWEEN THE CUTTING END OF SAID BODY PORTION AND SAID CLEARANCE THEREBEHIND, SAID FLUTES BEING GENERATED FROM SAID LEADING EDGES OF
Claim 2
Dependent Claim
132 words
A CORE BIT COMPRISING A RELATIVELY LONG SECTION OF THIN-WALLED CYLINDRICAL TUBING HAVING A SMOOTH OUTER SURFACE, A RELATIVELY SHORT BODY PORTION HAVING A SUBSTANSTIALLY CYLINDRICAL EXTERIOR SURFACE AND DEFINING AT ONE END THEREOF AN INTERNAL SHOULDER RECEIVING AN END OF SAID TUBING IN COAXIAL ALIGMENT THEREWITH, SAID CYLINDRICAL TUBING HAVING A DIAMETER LESS THAN THE DIAMETER OF SAID BODY PORTION SO AS TO PROVIDE CLEARANCE THEREBEHIND, A PLURALITY OF CIRCUMFERENTIALLY SPACED CUTTERS HAVING LEADING EDGES SECURED TO THE OTHER END OF SAID BODY PORTION, THE EXTERIOR SURFACE OF SAID BODY PORTION HAVING DEFINED THEREIN A PLURALITY OF SPIRAL FLUTES EXTENDING THE ENTIRE LENGTH OF SAID BODY PORTION AND PROVIDING COMMUNICATION BETWEEN THE CUTTING END OF SAID BODY PORTION AND SAID CLEARANCE THEREBEHIND, SAID FLUTES BEING GENERATED FROM SAID LEADING EDGES OF
References Cited (Backward Citations)
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US2499543A
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US2730335A
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US2761440A
Cited
US2856157A
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US2858109A
Cited
US2918260A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |