US3207023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw fastener
Assignee: Illinois Tool Works Inc
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Filing: 1964-09-04
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Granted: 1965-09-21
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Expires: 1984-09-04
Abstract
No abstract record available.
Inventors
- 👤 Knohl Friedrich Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:19
CPC Classifications
F; F16; F16B; F16B25/00; F16B25/001; F16B25/0031; F16B25/0036; F16B25/0042; F16B25/0068; F16B25/0084; F16B25/10; F16B25/103
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
A SCREW MEMBER FOR DRILLING INTO A NON-METALLIC WORKPIECE COMPRISING AN AXIALLY EXTENDING SHANK INCLUDING AN ELONGATED PORTION HAVING A SUBSTANTIALLY UNIFORM PREDETERMINED DIAMETER THROUGHOUT ITS LENGTH, A FIRST LONG LEAD HELICAL THREAD HAVING A PLURALITY OF CONVOLUTIONS ON SAID SHANK AND A RELATIVELY LARGE PREDETERMINED HEIGHT AND BEING OF SUBSTANTIALLY UNIFORM SIZE AND SHAPE THROUGHOUT, A SECOND LONG LEAD HELICAL THREAD HAVING A PLURALITY OF CONVOLUTIONS AND A HEIGHT SUBSTANTIALLY LESS THAN SAID PREDETERMINED HEIGHT AND SUBSTANTIALLY GREATER THAN SAID PREDETERMINED DIAMETER AND BEING OF SUBSTANTIALLY UNIFORM SIZE AND SHAPE THROUGHOUT, BOTH OF SAID THREADS HAVING CRESTS PRESENTING SHARP EDGES FOR FACILITATING PENETRATION OF A WORKPIECE, SAID FIRST THREAD HAVING A RELATIVELY SMALL INCLUDED ANGLE AND SAID SECOND THREAD HAVING AN INCLUDED ANGLE SUBSTANTIALLY LARGER THAN SAID FIRST THREAD, ALL OF SAID THREADS HAVING ROOTS OF SUBSTANTIALLY THE SAME AXIAL EXTENT, AND SAID SHANK INCLUDING A SUBSTANTIALLY POINTED WORK DRILLING TIP, ALL OF SAID THREADS HAVING A SUBSTANTIALLY UNIFORM ROOT DIAMETER THROUGHOUT AND SUB-
Claim 2
Dependent Claim
165 words
A SCREW MEMBER FOR DRILLING INTO A NON-METALLIC WORKPIECE COMPRISING AN AXIALLY EXTENDING SHANK INCLUDING AN ELONGATED PORTION HAVING A SUBSTANTIALLY UNIFORM PREDETERMINED DIAMETER THROUGHOUT ITS LENGTH, A FIRST LONG LEAD HELICAL THREAD HAVING A PLURALITY OF CONVOLUTIONS ON SAID SHANK AND A RELATIVELY LARGE PREDETERMINED HEIGHT AND BEING OF SUBSTANTIALLY UNIFORM SIZE AND SHAPE THROUGHOUT, A SECOND LONG LEAD HELICAL THREAD HAVING A PLURALITY OF CONVOLUTIONS AND A HEIGHT SUBSTANTIALLY LESS THAN SAID PREDETERMINED HEIGHT AND SUBSTANTIALLY GREATER THAN SAID PREDETERMINED DIAMETER AND BEING OF SUBSTANTIALLY UNIFORM SIZE AND SHAPE THROUGHOUT, BOTH OF SAID THREADS HAVING CRESTS PRESENTING SHARP EDGES FOR FACILITATING PENETRATION OF A WORKPIECE, SAID FIRST THREAD HAVING A RELATIVELY SMALL INCLUDED ANGLE AND SAID SECOND THREAD HAVING AN INCLUDED ANGLE SUBSTANTIALLY LARGER THAN SAID FIRST THREAD, ALL OF SAID THREADS HAVING ROOTS OF SUBSTANTIALLY THE SAME AXIAL EXTENT, AND SAID SHANK INCLUDING A SUBSTANTIALLY POINTED WORK DRILLING TIP, ALL OF SAID THREADS HAVING A SUBSTANTIALLY UNIFORM ROOT DIAMETER THROUGHOUT AND SUB-
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) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |