Patent US2621428A successfully refreshed from Google Patents.
US2621428A
Expired / Lapsed
US
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Clamshell bucket
Assignee: Individual
•
Filing: 1946-06-21
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Granted: 1952-12-16
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Expires: 1966-06-21
Abstract
No abstract record available.
Inventors
- 👤 Roy O Billings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:42
CPC Classifications
B; B66; B66C; B66C3/00; B66C3/14; B66C3/16; E; E02; E02F; E02F3/00; E02F3/04; E02F3/46; E02F3/47
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE273437C
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DE277014C
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US468652A
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US539921A
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US1096214A
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US1564041A
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US1737252A
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DE629332C
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US2136890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |