US3598312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic crosstie
Assignee: Portec Inc
•
Filing: 1968-12-16
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Granted: 1971-08-10
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Expires: 1988-12-16
Abstract
Abstract A synthetic crosstie for railway track having integral canted rail-supporting portions and also having cross-sectional shapes adapted to adequately embed themselves into the ballast while taking into account minimum interference with ballast-tamping apparatus.
Inventors
- 👤 William R Hamilton Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:30
CPC Classifications
E; E01; E01B; E01B9/00; E01B9/68; E01B3/00; E01B3/44; E01B9/681; E01B9/685
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
108 words
A railway crosstie including, a longitudinally extending body of molded synthetic resinous composition having a top surface, said body provided with a pair of integral rail seats molded adjacent opposite ends thereof, each said rail seat having an upper planar surface disposed in a plane disposed both offset from and angled with respect to the adjacent said body top surface, a separate tie pad element overlyinG each said rail seat and bonded to said upper planar surface, each said tie pad comprising a disparate planar layer of synthetic resinous composition compatible with said tie body composition and adhered thereto to provide an integral synthetic crosstie and pad unit.
Claim 2
Dependent Claim
108 words
A railway crosstie including, a longitudinally extending body of molded synthetic resinous composition having a top surface, said body provided with a pair of integral rail seats molded adjacent opposite ends thereof, each said rail seat having an upper planar surface disposed in a plane disposed both offset from and angled with respect to the adjacent said body top surface, a separate tie pad element overlyinG each said rail seat and bonded to said upper planar surface, each said tie pad comprising a disparate planar layer of synthetic resinous composition compatible with said tie body composition and adhered thereto to provide an integral synthetic crosstie and pad unit.
Claim 3
Dependent Claim
20 words
A railway crosstie according to claim 1, wherein the rail seats are elevated above the top surface of the tie.
Claim 4
Dependent Claim
20 words
A railway crosstie according to claim 1, wherein the rail seats are recessed beneath the top surface of the tie.
Claim 5
Dependent Claim
31 words
A railway crosstie according to claim 1, wherein the base of the tie is substantially wider than the top thereof to reduce the inert load between the tie and the ballast.
Claim 6
Dependent Claim
49 words
A railway crosstie according to claim 1 wherein, said body includes a pair of identical half sections, the juxtaposed end faces of each said half section provided with a keystone pocket, and connecting means insertable in said pair of opposed pockets to fixedly join said pair of half sections.
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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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |