US2581431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiographic apparatus
Assignee: Individual
•
Filing: 1949-09-12
•
Granted: 1952-01-08
•
Expires: 1969-09-12
Abstract
No abstract record available.
Inventors
- 👤 Robert J Nelsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:10
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/50; A61B6/51; A61B6/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1753151A
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US1832865A
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US1026158A
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US1048433A
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US1164987A
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US2120729A
Cited
US2366430A
Cited
US2436279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |