US2565716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric tube shielding means
Assignee: Individual
•
Filing: 1947-01-20
•
Granted: 1951-08-28
•
Expires: 1967-01-20
Abstract
No abstract record available.
Inventors
- 👤 Boyce Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:54
CPC Classifications
H; H01; H01J; H01J40/00; H01J40/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1905276A
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US1924435A
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US2161859A
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GB490381A
Cited
US2166205A
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US2222788A
Cited
US2207097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-27 | 1955-02-26 | 1955-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-27 | 1959-02-26 | 1959-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-27 | 1963-02-26 | 1963-08-28 | $7700.00 | Window Closed / Lapsed |