US3564948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill
Assignee: Illinois Tool Works Inc
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Filing: 1968-12-06
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Granted: 1971-02-23
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Expires: 1988-12-06
Abstract
Abstract THE INVENTION RELATES TO A DOUBLE FLUTE DRILL HAVING ANGULARLY DISPOSED OPPOSITELY POSITIONED SLOTS SERVING AS FLUTES ON A DRILLING END OR TIP, A REDUCED SHANK PORTION, AND A SECOND SHANK PORTION FOR COOPERATION WITH A TOOL FOR ROTATING THE DRILL. THE AIM OF THE INVENTION IS TO PROVIDE A DRILL CAPABLE OF BEING USED FOR A SERIES OF OPERATIONS AND WHICH IS INEXPENSIVE ENOUGH TO BE DISPOSED OF RATHER THAN BEING RESHARPENED.
Inventors
- 👤 Henry Pomernacki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:48
CPC Classifications
B; B23; B23B; B23B51/00; B23B51/10; Y; Y10; Y10T; Y10T408/00; Y10T408/89; Y10T408/899; Y10T408/904; Y10T408/907
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |