Patent US2845893A successfully refreshed from Google Patents.
Patent US3263473A successfully refreshed from Google Patents.
US3263473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for making threaded fasteners
Assignee: Research Engineering and Manufacturing Inc
•
Filing: 1964-03-12
•
Granted: 1966-08-02
•
Expires: 1984-03-12
Abstract
No abstract record available.
Inventors
- 👤 Jr Harvey F Phipard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:53
CPC Classifications
B; B21; B21H; B21H3/00; B21H3/02; B21H3/027
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
THE METHOD OF MAKING A SELF-TAPPING SCREW HAVING A ROUND SHANK AND A TAPERED LOBULAR THREAD-FORMING END PORTION, SAID METHOD INCLUDING THE STEPS: (A) FORMING A BLANK HAVING A ROUND SHANK PORTION AND A THREAD-FORMING END PORTION, (B) THEN ROLLING SAID BLANK BETWEEN A PAIR OF OPPOSED THREAD-FORMING DIE SURFACES WHILE APPLYING THREADFORMING PRESSURES TO SAID SHANK AND THREAD-FORMING END PORTIONS, (C) AND DURING SAID ROLLING, AT LEAST WHILE APPLYING THREAD-FORMING PRESSURE TO SAID SHANK PORTION, MAINTAINING A NON-UNDULATING DISTANCE BETWEEN THE AXIS OF SAID BLANK IN SAID SHANK PORTION AND THE ADJACENT DIE SURFACES AND THEREBY GENERATING A CONTINUOUS HELICAL THREAD FORMATION ON SAID SHANK PORTION HAVING CIRCULAR PITCH DIAMETER CROSS SECTIONS, (D) AND FURTHER DURING SAID ROLLING, AT LEAST WHILE APPLYING THREADED-FORMING PRESSURE TO SAID END PORTION. CAUSING SAID AXIS IN SAID END PORTION TO UNDULATE RELATIVE TO THE ADJACENT PORTIONS OF SAID DIE SURFACES, AND THEREBY GENERATING ON SAID END PORTION A CONTINUATION OF SAID HELICAL THREAD FORMATION HAVING LOBULAR PITCH DIAMETER CROSS SECTIONS OF ARCUATE POLYGONAL CONFIGURATION.
Claim 2
Independent Claim
171 words
THE METHOD OF MAKING A SELF-TAPPING SCREW HAVING A ROUND SHANK AND A TAPERED LOBULAR THREAD-FORMING END PORTION, SAID METHOD INCLUDING THE STEPS: (A) FORMING A BLANK HAVING A ROUND SHANK PORTION AND A THREAD-FORMING END PORTION, (B) THEN ROLLING SAID BLANK BETWEEN A PAIR OF OPPOSED THREAD-FORMING DIE SURFACES WHILE APPLYING THREADFORMING PRESSURES TO SAID SHANK AND THREAD-FORMING END PORTIONS, (C) AND DURING SAID ROLLING, AT LEAST WHILE APPLYING THREAD-FORMING PRESSURE TO SAID SHANK PORTION, MAINTAINING A NON-UNDULATING DISTANCE BETWEEN THE AXIS OF SAID BLANK IN SAID SHANK PORTION AND THE ADJACENT DIE SURFACES AND THEREBY GENERATING A CONTINUOUS HELICAL THREAD FORMATION ON SAID SHANK PORTION HAVING CIRCULAR PITCH DIAMETER CROSS SECTIONS, (D) AND FURTHER DURING SAID ROLLING, AT LEAST WHILE APPLYING THREADED-FORMING PRESSURE TO SAID END PORTION. CAUSING SAID AXIS IN SAID END PORTION TO UNDULATE RELATIVE TO THE ADJACENT PORTIONS OF SAID DIE SURFACES, AND THEREBY GENERATING ON SAID END PORTION A CONTINUATION OF SAID HELICAL THREAD FORMATION HAVING LOBULAR PITCH DIAMETER CROSS SECTIONS OF ARCUATE POLYGONAL CONFIGURATION.
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) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |