Patent US2451409A successfully refreshed from Google Patents.
US2451409A
Expired / Lapsed
US
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Portable collimator apparatus fob
Assignee: —
•
Filing: —
•
Granted: 1948-10-12
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Expires: 1965-10-12
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:20
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/26; G01B11/27
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1589797A
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US1955746A
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US2324444A
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US2364152A
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US2365361A
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US2384643A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-12 | 1952-04-12 | 1952-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-12 | 1956-04-12 | 1956-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-12 | 1960-04-12 | 1960-10-12 | $7700.00 | Window Closed / Lapsed |