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US3587476A
Expired / Lapsed
US
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Reinforced fiberglass hatch cover
Assignee: Midland Ross Corp
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Filing: 1968-09-16
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Granted: 1971-06-28
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Expires: 1988-09-16
Abstract
Abstract A HOLLOW FIBERGLASS HATCH COVER FOR A ROOF HATCH OF A COVERED RAILWAY HOPPER CAR FORMED OF SEPARATELY MOLDED TOP AND BOTTOM FIBERGLASS PANELS AND REINFORCED LONGITUDINALLY BY INTERNAL TRUSSING AND LATERALLY BY EXTERNAL RIBBING CONNECTING ADJOINING SECTIONS OF THE TOP PANEL FOR COMBINING GREAT STRENGTH AND DURABILITY WITH VERY LIGHT WEIGHT.
Inventors
- 👤 Orville Ingram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:57
CPC Classifications
B; B61; B61D; B61D39/00; B61D5/00; B61D5/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |