Patent US2617180A successfully refreshed from Google Patents.
US2617180A
Expired / Lapsed
US
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Spring expander prop
Assignee: Individual
•
Filing: 1950-05-23
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Granted: 1952-11-11
•
Expires: 1970-05-23
Abstract
No abstract record available.
Inventors
- 👤 Edward D Wilkerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:14
CPC Classifications
E; E05; E05D; E05D3/00; E05D3/06; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53613; Y10T29/53622
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1384472A
Cited
US1428566A
Cited
US1591301A
Cited
US1690731A
Cited
US2465030A
Cited
US2522611A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |