US3136205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-tapping wood screw
Assignee: PL Robertson Manufacturing Co Ltd
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Filing: 1962-02-19
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Granted: 1964-06-09
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Expires: 1982-02-19
Abstract
No abstract record available.
Inventors
- 👤 Carl H Ansingh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:47
CPC Classifications
F; F16; F16B; F16B25/00; F16B25/001; F16B25/0015; F16B25/0036; F16B25/0084; F16B25/10; F16B25/103
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A SELF-TAPPING WOOD SCREW PROVIDED WITH A POINTED PORTION HAVING SPIRAL THREAD FORMATIONS FORMED THEREON SEPARATED BY SPIRAL LANDS, SAID SPIRAL THREAD FORMATIONS BEING INTERRUPTED BY A GROOVE EXTENDING UPWARDLY SUBSTANTIALLY FROM THE TIP OF SAID POINTED PORTION AND PRESENTING AT ONE EDGE THEREOF A PLURALITY OF WOOD CUTTING CHISEL ELEMENTS, THE THREAD FORMATIONS AT THE OPPOSITE SIDE OF SAID GROOVE AT LEAST AT THE LOWER END OF THE SCREW BEING TURNED UPWARDLY WITH RESPECT TO THE SAID TIP TO EXTEND AT LEAST PART WAY ACROSS SAID LANDS AT GRADUALLY REDUCING HEIGHT FROM THE SCREW AXIS AND PRESENTING SHARP
Claim 2
Dependent Claim
99 words
A SELF-TAPPING WOOD SCREW PROVIDED WITH A POINTED PORTION HAVING SPIRAL THREAD FORMATIONS FORMED THEREON SEPARATED BY SPIRAL LANDS, SAID SPIRAL THREAD FORMATIONS BEING INTERRUPTED BY A GROOVE EXTENDING UPWARDLY SUBSTANTIALLY FROM THE TIP OF SAID POINTED PORTION AND PRESENTING AT ONE EDGE THEREOF A PLURALITY OF WOOD CUTTING CHISEL ELEMENTS, THE THREAD FORMATIONS AT THE OPPOSITE SIDE OF SAID GROOVE AT LEAST AT THE LOWER END OF THE SCREW BEING TURNED UPWARDLY WITH RESPECT TO THE SAID TIP TO EXTEND AT LEAST PART WAY ACROSS SAID LANDS AT GRADUALLY REDUCING HEIGHT FROM THE SCREW AXIS AND PRESENTING SHARP
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) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |