Patent US4718801A successfully refreshed from Google Patents.
US4718801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite core fastener
Assignee: FIRST SECURITY BANK OF IDAHO NA
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Filing: 1986-07-24
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Granted: 1988-01-12
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Expires: 2006-07-24
Abstract
Abstract A fastener comprises composite head and shank portions having an encapsulating metal sheath thereon that is electrically isolated from conductive fibers in the head and shank portions and from an exposed surface of the head portion.
Inventors
- 👤 Imre Berecz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:32
CPC Classifications
B; B64; B64D; B64D45/00; B64D45/02; F; F16; F16B; F16B33/00; F16B33/006; Y; Y10; Y10S; Y10S411/00; Y10S411/90; Y10S411/901; Y10S411/904; Y10S411/908
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
102 words
A fastener comprising a composite core having an enlarged head portion at one end and a shank portion at the other end said head portion being of a diameter greater than that of said shank portion, and a metal sleeve encapsulating the shank portion of said core and a portion of the head portion and an outer surface of said sleeve being threaded for the acceptance of a nut, said metal sleeve being spaced axially from an axial end face of the head portion whereby said metal sleeve is electrically isolated from the end surface on the head portion of said fastener.
Claim 2
Dependent Claim
102 words
A fastener comprising a composite core having an enlarged head portion at one end and a shank portion at the other end said head portion being of a diameter greater than that of said shank portion, and a metal sleeve encapsulating the shank portion of said core and a portion of the head portion and an outer surface of said sleeve being threaded for the acceptance of a nut, said metal sleeve being spaced axially from an axial end face of the head portion whereby said metal sleeve is electrically isolated from the end surface on the head portion of said fastener.
Claim 3
Dependent Claim
34 words
A composite core fastener in accordance with claim 1 wherein said core comprises a plurality of electrically conductive fibers electrically isolated from one another and from said metal sleeve by a nonconductive resin matrix.
Claim 4
Dependent Claim
123 words
A composite core fastener comprising an inner composite core having an enlarged head portion at one end and a shank portion at the other end said head portion being of a diameter greater than that of said shank portion, a metal sleeve encapsulating the shank portion of said fastener and a portion of the head portion thereof, said metal sleeve terminating below an upper end surface of the head portion of said fastener, and a nonconductive sheath interposed between the composite shank portion and metal sleeve of said fastener to further electrically isolate said metal sleeve from the upper end surface of the head portion of said fastener and an outer surface of said sleeve being threaded for the acceptance of a nut.
Claim 5
Dependent Claim
123 words
A composite core fastener comprising an inner composite core having an enlarged head portion at one end and a shank portion at the other end said head portion being of a diameter greater than that of said shank portion, a metal sleeve encapsulating the shank portion of said fastener and a portion of the head portion thereof, said metal sleeve terminating below an upper end surface of the head portion of said fastener, and a nonconductive sheath interposed between the composite shank portion and metal sleeve of said fastener to further electrically isolate said metal sleeve from the upper end surface of the head portion of said fastener and an outer surface of said sleeve being threaded for the acceptance of a nut.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-11 | 1991-07-13 | 1992-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-11 | 1995-07-13 | 1996-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-11 | 1999-07-13 | 2000-01-12 | $7700.00 | Window Closed / Lapsed |