Patent US3401647A successfully refreshed from Google Patents.
US3401647A
Expired / Lapsed
US
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Hatches for railway covered hopper cars
Assignee: Midland Ross Corp
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Filing: 1966-12-12
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Granted: 1968-09-17
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Expires: 1986-12-12
Abstract
No abstract record available.
Inventors
- 👤 Ingram Orville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:56
CPC Classifications
E; E06; E06B; E06B7/00; E06B7/16; E06B7/22; E06B7/23; E06B7/2318; E06B7/2305; E06B7/2312
Claims Analysis
Total Claims: 0
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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) | 1971-09-17 | 1972-03-18 | 1972-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-17 | 1976-03-18 | 1976-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-17 | 1980-03-18 | 1980-09-17 | $7700.00 | Window Closed / Lapsed |