Patent US2553897A successfully refreshed from Google Patents.
US2553897A
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US
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Material handling apparatus
Assignee: WELLMAN ENGINEERING Co
•
Filing: 1947-04-03
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Granted: 1951-05-22
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Expires: 1967-04-03
Abstract
No abstract record available.
Inventors
- 👤 Robert W Crist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:54
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US300481A
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US956338A
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US1284034A
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US1413934A
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US1962734A
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US2107532A
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US2164796A
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US2348372A
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US2396954A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |