US2444560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode-ray tube spectrograph
Assignee: Allen B du Mont Laboratories Inc
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Filing: 1944-04-15
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Granted: 1948-07-06
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Expires: 1964-04-15
Abstract
No abstract record available.
Inventors
- 👤 Feldt Rudolf
- 👤 Berkley Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:38
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J3/30; G01J3/32
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) | 1951-07-06 | 1952-01-05 | 1952-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-06 | 1956-01-05 | 1956-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-06 | 1960-01-05 | 1960-07-06 | $7700.00 | Window Closed / Lapsed |