US3008522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective cross-over devices
Assignee: Otis Engineering Corp
•
Filing: 1954-09-07
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Granted: 1961-11-14
•
Expires: 1974-09-07
Abstract
No abstract record available.
Inventors
- 👤 John V Fredd
- 👤 Harry B Schramm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:25
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/122; E21B43/00; E21B43/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2403987A
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US2368428A
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US2433942A
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US2531258A
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US2695671A
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US2766831A
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US2649916A
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US2717041A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-11-13 | 1965-05-15 | 1965-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-13 | 1969-05-15 | 1969-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-13 | 1973-05-15 | 1973-11-14 | $7700.00 | Window Closed / Lapsed |