Patent US2803299A successfully refreshed from Google Patents.
US2803299A
Expired / Lapsed
US
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Grain door for a railway car
Assignee: A J Gerrard and Co
•
Filing: 1953-04-23
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Granted: 1957-08-20
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Expires: 1973-04-23
Abstract
No abstract record available.
Inventors
- 👤 John M Gerrard
- 👤 Melvin E Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:58
CPC Classifications
B; B61; B61D; B61D19/00; B61D19/001; B61D19/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2073894A
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US2116260A
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US2203107A
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US2310860A
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US2361081A
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US2428325A
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US2575666A
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US2646117A
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US2561781A
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US2581991A
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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) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |