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US2774121A
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Joint for structural sections
Assignee: Otis Elevator Co
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Filing: 1951-02-24
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Granted: 1956-12-18
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Expires: 1971-02-24
Abstract
No abstract record available.
Inventors
- 👤 Graevenitz Henry Ludwig
- 👤 Dunham Frederick Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:22
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/38; E04B1/61; E04B1/6108; E04B1/6116; E04B1/612; E04B1/6179
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE204987C
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US1971320A
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US706763A
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US1871618A
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US1919780A
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US2142305A
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US2215076A
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US2092552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |