Wear resistant surface for polyurethane foam material on surface of railway car
Abstract
Abstract An insulated covered hopper railway car having a layer of rigid polyurethane foam applied on the outer surface thereof by spraying in place. An outer coat of a polyester resin is applied, such as by manual brushing, onto the outer surface of the polyurethane foam material on certain areas of the polyurethane foam material which are exposed to wear and abrasion, such as roof areas adjacent the walkway or running board and areas between the separate hatch covers. A layer of fibrous material, such as woven fiberglass, is then positioned on the coat of polyester resin. Then, the fibrous material is brushed and rolled to remove any air and to embed the material in the coat of polyester resin. The resin is then allowed to gel and cure which will be around 45 minutes at 77* F.
Inventors
- 👤 Frank R Yurkoski
- 👤 Philip J De Frank
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |