US4648224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tendon for prestressed concrete
Assignee: Japan National Railways
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Filing: 1985-03-15
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Granted: 1987-03-10
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Expires: 2005-03-15
Abstract
Abstract A tendon for prestressed concrete wherein inorganic particles are coated on an outer surface of a rod made of fiber reinforced plastic through a plastic adhesive layer. The inorganic particles are formed with minute rugged surface portions on the outer surface of the tendon for prestressed concrete, the rugged surface portions being firmly adhered to concrete. The inorganic particles are coated on the whole outer surface of the tendon for prestressed concrete, on the fixed portions at both ends, or on the fixed portions at both ends and on a portion subjected to the maximum bending moment.
Inventors
- 👤 Toshiyuki Kitta
- 👤 Hiroshi Tada
- 👤 Keizo Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:02
CPC Classifications
E; E04; E04C; E04C5/00; E04C5/07; E04C5/08; Y; Y10; Y10S; Y10S52/00; Y10S52/07; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2927
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
52 words
A tendon for pretensioning a concrete structure, comprising: a rod-like or linear tendon formed of fiber reinforced plastic covered by a plastic adhesive layer, said adhesive layer on its outer surface having a dense and uniform mass of inorganic particles of a particle size ranging from 300 μm-1000 μm partially embedded therein.
Claim 2
Dependent Claim
52 words
A tendon for pretensioning a concrete structure, comprising: a rod-like or linear tendon formed of fiber reinforced plastic covered by a plastic adhesive layer, said adhesive layer on its outer surface having a dense and uniform mass of inorganic particles of a particle size ranging from 300 μm-1000 μm partially embedded therein.
Claim 3
Dependent Claim
32 words
The tendon according to claim 1, wherein said inorganic particles are selected from the group consisting of silicon carbide particles, aluminum oxide particles, silicon dioxide particles, glass particles and stainless steel particles.
Claim 4
Dependent Claim
77 words
A tendon for pretensioning a concrete structure, comprising: a rod-like or linear tendon formed of fiber reinforced plastic, said tendon being covered by an adhesive plastic layer at both ends and in sections of the tendon which are to be subjected to the maximum bending moment in the concrete structure, said adhesive plastic layer covered sections having a dense and uniforms mass of inorganic particles of a particle size ranging from 300 μm-1000 μm partially embedded therein.
Claim 5
Dependent Claim
77 words
A tendon for pretensioning a concrete structure, comprising: a rod-like or linear tendon formed of fiber reinforced plastic, said tendon being covered by an adhesive plastic layer at both ends and in sections of the tendon which are to be subjected to the maximum bending moment in the concrete structure, said adhesive plastic layer covered sections having a dense and uniforms mass of inorganic particles of a particle size ranging from 300 μm-1000 μm partially embedded therein.
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) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |