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US2638554A
Expired / Lapsed
US
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Directivity control of x-rays
Assignee: BARTOW BEACONS Inc
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Filing: 1949-10-05
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Granted: 1953-05-12
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Expires: 1969-10-05
Abstract
No abstract record available.
Inventors
- 👤 John B Bartow
- 👤 Jack A Bartow
- 👤 Jr Grey D Maclaughlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:01
CPC Classifications
G; G21; G21K; G21K1/00; G21K1/02; G21K1/025; H; H01; H01J; H01J35/00; H01J35/24; H01J35/30; A; A61; A61N; A61N5/00; A61N5/10; A61N5/1077; A61N5/1084
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |