US2936907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable gantry crane
Assignee: D W WINKELMAN Co
•
Filing: 1957-11-01
•
Granted: 1960-05-17
•
Expires: 1977-11-01
Abstract
No abstract record available.
Inventors
- 👤 Ralph D Woodruff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:13
CPC Classifications
B; B66; B66C; B66C19/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL7384C
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BE503569A
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US510495A
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US700162A
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US908522A
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DE331781C
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DE705784C
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US2475963A
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US2415907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-17 | 1963-11-16 | 1964-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-17 | 1967-11-16 | 1968-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-17 | 1971-11-16 | 1972-05-17 | $7700.00 | Window Closed / Lapsed |