Patent US4478544A successfully refreshed from Google Patents.
US4478544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite rivet
Assignee: Microdot Inc
•
Filing: 1982-06-04
•
Granted: 1984-10-23
•
Expires: 2002-06-04
Abstract
Abstract The disclosure relates to a reinforced plastic rivet comprising a plurality of substantially continuous carbon fibres encapsulated in a partially polymerized thermoset resin matrix and enveloped in a high tensile strength low modulus tubular sheath. A portion of the rivet is deformable to form a head and fully polymerizable upon heating thereof.
Inventors
- 👤 Norman S. Strand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:11
CPC Classifications
F; F16; F16B; F16B19/00; F16B19/04; F16B19/08; F16B19/12; B; B29; B29C; B29C65/00; B29C65/56; B29C65/60; B29C65/601; B29C65/602; B29C66/00; B29C66/40; B29C66/41; B29C66/70; B29C66/72; B29C66/721; B29C66/7212; B29C66/7214; B29C66/72141; B29C66/73; B29C66/739; B29C66/7394; B29C66/80; B29C66/81; B29C66/814; B29C66/8141; B29C66/81411; B29C66/81421; B29C66/81423; F16B19/10; F16B19/1027; F16B19/1036; F16B19/1045; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/83; B29C66/832; B29C66/8322; B29K; B29K2101/00; B29K2101/10; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/10; B29K2105/101; Y; Y10; Y10S; Y10S411/00; Y10S411/90; Y10S411/901; Y10S411/904; Y10S411/908; Y10S411/909; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/249942; Y10T428/249945
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
89 words
A reinforced thermoset plastic rivet comprising: a plurality of substantially parallel continuous longitudinally extending carbon fibres encapsulated in a B-stage thermoset resin matrix, a plurality of longitudinally and circumferentially extending aromatic polyamid fibres enveloping said carbon fibres and encapsulated in a B-stage thermoset resin matrix, at least one portion of said rivet being deformable to form a rivet head and fully polymerizable to the thermoset condition upon heating thereof, said polyamid fibres enveloping said carbon fibres after formation of said rivet head to preclude splaying of said carbon fibres.
Claim 2
Dependent Claim
89 words
A reinforced thermoset plastic rivet comprising: a plurality of substantially parallel continuous longitudinally extending carbon fibres encapsulated in a B-stage thermoset resin matrix, a plurality of longitudinally and circumferentially extending aromatic polyamid fibres enveloping said carbon fibres and encapsulated in a B-stage thermoset resin matrix, at least one portion of said rivet being deformable to form a rivet head and fully polymerizable to the thermoset condition upon heating thereof, said polyamid fibres enveloping said carbon fibres after formation of said rivet head to preclude splaying of said carbon fibres.
Claim 3
Dependent Claim
40 words
A rivet in accordance with claim 1 including: a mandrel extending centrally thereof and having a head forming portion movable axially relative to said carbon and polyamid fibres to effect lateral displacement thereof to form a head on said rivet.
References Cited (Backward Citations)
US371884A
Cited
US2257538A
Cited
US2510693A
Cited
GB612074A
Cited
BE519317A
Cited
US2994933A
Cited
US3296048A
Cited
US3354260A
Cited
US3544143A
Cited
US3492909A
Cited
US3568311A
Cited
US3778334A
Cited
US4306824A
Cited
SU812993A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |