US2580155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Proximity detector employing microwaves
Assignee: Westinghouse Air Brake Co
•
Filing: 1949-06-04
•
Granted: 1951-12-25
•
Expires: 1969-06-04
Abstract
No abstract record available.
Inventors
- 👤 Paul M Brannen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:43
CPC Classifications
B; B61; B61L; B61L13/00; B61L13/04; B61L13/047
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2206923A
Cited
US2197028A
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US2247246A
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US2403955A
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US2455940A
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US2455942A
Cited
US2454687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |