US3246556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-tapping threaded fasteners
Assignee: Research Engineering and Manufacturing Inc
•
Filing: 1965-02-08
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Granted: 1966-04-19
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Expires: 1985-02-08
Abstract
No abstract record available.
Inventors
- 👤 Jr Harvey F Phipard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:54
CPC Classifications
F; F16; F16B; F16B25/00; F16B25/0036; F16B25/0078; B; B21; B21H; B21H3/00; B21H3/02; B21H3/027; F16B25/001; F16B25/0021; F16B25/0084
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A THREAD-FORMING FASTENER DEVICE HAVING A CONTINUOUS ROLLED THREAD FORMATION ON BOTH SHANK AND WORKENTERING PORTIONS AND WITH THE PITCH SURFACE CROSS SECTIONS BEING OF DIFFERENT CONFIGURATION ON SAID TWO PORTIONS, (A) THE CREST OF THE THREAD ON SAID WORK-ENTERING PORTION DEFINING A LOBULAR CONICAL SURFACE OF NON-CIRCULAR CROSS-SECTION TAPERING INWARDLY TOWARD THE WORKENTERING END, (B) THE THREAD FORMATION ON SAID WORK-ENTERING END HAVING PITCH SURFACE CROSS SECTIONS IN THE FORM OF A GENERALLY ARCUATE TRIANGLE, EACH OF SUCH CROSS SECTIONS BEING OF SUBSTANTIALLY UNIFORM WIDTH THROUGHOUT 360 DEGREES, (C) SAID TRIANGLE INCLUDING SYMMETRICALLY ARRANGED ARCUATE SIDES MERGING GRADUALLY WITH INTERMEDIATE ARCUATE LOBES FORMING THE APICES OF THE TRIANGLE, (D) THE RADIUS OF CURVATURE OF SAID SIDES OF SAID TRIANGLE IN EACH TRANSVERSE CROSS SECTION BEING GREATER THAN ONE-HALF OF, BUT NOT GREATER THAN THE WIDTH OF, SUCH CROSS SECTION, (E) THE RADIUS OF CURVATURE OF SAID LOBES OF SAID TRI-
Claim 2
Dependent Claim
151 words
A THREAD-FORMING FASTENER DEVICE HAVING A CONTINUOUS ROLLED THREAD FORMATION ON BOTH SHANK AND WORKENTERING PORTIONS AND WITH THE PITCH SURFACE CROSS SECTIONS BEING OF DIFFERENT CONFIGURATION ON SAID TWO PORTIONS, (A) THE CREST OF THE THREAD ON SAID WORK-ENTERING PORTION DEFINING A LOBULAR CONICAL SURFACE OF NON-CIRCULAR CROSS-SECTION TAPERING INWARDLY TOWARD THE WORKENTERING END, (B) THE THREAD FORMATION ON SAID WORK-ENTERING END HAVING PITCH SURFACE CROSS SECTIONS IN THE FORM OF A GENERALLY ARCUATE TRIANGLE, EACH OF SUCH CROSS SECTIONS BEING OF SUBSTANTIALLY UNIFORM WIDTH THROUGHOUT 360 DEGREES, (C) SAID TRIANGLE INCLUDING SYMMETRICALLY ARRANGED ARCUATE SIDES MERGING GRADUALLY WITH INTERMEDIATE ARCUATE LOBES FORMING THE APICES OF THE TRIANGLE, (D) THE RADIUS OF CURVATURE OF SAID SIDES OF SAID TRIANGLE IN EACH TRANSVERSE CROSS SECTION BEING GREATER THAN ONE-HALF OF, BUT NOT GREATER THAN THE WIDTH OF, SUCH CROSS SECTION, (E) THE RADIUS OF CURVATURE OF SAID LOBES OF SAID TRI-
References Cited (Backward Citations)
US66766A
Cited
US2352982A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |