US3730048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw with a head looking like a true circle
Assignee: Individual
•
Filing: 1971-05-25
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Granted: 1973-05-01
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Expires: 1991-05-25
Abstract
Abstract A screw with a head looking like a true circle. This appearance is achieved by forming the circumference of the top surface of a screw head into a true circle and forming the periphery of the screw head which immediately follows said true circle of the top surface into an oval. The oval consists of a short diameter being approximately the same as the diameter of the true circle of the top surface and a long diameter being slightly longer than the diameter of the top surface.
Inventors
- 👤 J Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:38
CPC Classifications
F; F16; F16B; F16B23/00; F16B23/0007; Y; Y10; Y10S; Y10S411/00; Y10S411/919
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
187 words
A screw comprising a first member having an external screw thread thereon and a second member forming the head of said screw, said head having the appearance of a true circle and comprising a first portion remote from said screw thread, said first portion comprising the top surface of said screw head and having a circular configuration; a second portion concentric with said first portion and positioned between said first portion and said screw thread, said second portion having an oval configuration, said oval portion having a minor axis and a major axis very slightly longer than said minor axis, said minor axis being substantially the same length as the diameter of said circular first portion, and the upper edge of said first and second portions being convexly chamfered with the chamfer of said first portion immediately following said top surface of the screw and blending into said second portion, whereby said first and second portions blend smoothly into each other throughout the periphery of said head, thereby forming a head structure which appears to be in the form of a true circle when looking down thereon.
Claim 2
Dependent Claim
187 words
A screw comprising a first member having an external screw thread thereon and a second member forming the head of said screw, said head having the appearance of a true circle and comprising a first portion remote from said screw thread, said first portion comprising the top surface of said screw head and having a circular configuration; a second portion concentric with said first portion and positioned between said first portion and said screw thread, said second portion having an oval configuration, said oval portion having a minor axis and a major axis very slightly longer than said minor axis, said minor axis being substantially the same length as the diameter of said circular first portion, and the upper edge of said first and second portions being convexly chamfered with the chamfer of said first portion immediately following said top surface of the screw and blending into said second portion, whereby said first and second portions blend smoothly into each other throughout the periphery of said head, thereby forming a head structure which appears to be in the form of a true circle when looking down thereon.
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) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |