US2649538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Space intrusion detection system
Assignee: Westinghouse Air Brake Co
•
Filing: 1949-10-13
•
Granted: 1953-08-18
•
Expires: 1969-10-13
Abstract
No abstract record available.
Inventors
- 👤 Elbert W Marlowe
- 👤 Paul M Brannen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:42
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/18; G08B13/181; G08B13/183
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2038878A
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US1972682A
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US2203807A
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US2401929A
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US2435423A
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US2467257A
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US2465925A
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US2476639A
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US2480868A
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US2488815A
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US2499805A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-17 | 1957-02-16 | 1957-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-17 | 1961-02-16 | 1961-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-17 | 1965-02-16 | 1965-08-18 | $7700.00 | Window Closed / Lapsed |