US2494440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectrophotometer apparatus having a rotating slotted wheel to decrease light intensity
Assignee: RCA Corp
•
Filing: 1946-05-31
•
Granted: 1950-01-10
•
Expires: 1966-05-31
Abstract
No abstract record available.
Inventors
- 👤 Harold E Haynes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:15
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/10; G01J1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1799134A
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US1863363A
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GB389214A
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US1999023A
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US2186203A
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US2240722A
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US2234329A
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US2287322A
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US2267282A
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US2442910A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-09 | 1953-07-11 | 1954-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-09 | 1957-07-11 | 1958-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-09 | 1961-07-11 | 1962-01-10 | $7700.00 | Window Closed / Lapsed |