US2512153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Split-field dual-power telescope
Assignee: United States, WAR, Secretary of
•
Filing: 1947-05-23
•
Granted: 1950-06-20
•
Expires: 1967-05-23
Abstract
No abstract record available.
Inventors
- 👤 Louis G Henyey
- 👤 Jesse L Greenstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:05
CPC Classifications
G; G02; G02B; G02B15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191115123A
Cited
DE312317C
Cited
US578459A
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US841262A
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US1094724A
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GB191501727A
Cited
US1290777A
Cited
US1840931A
Cited
US1986731A
Cited
US2409186A
Cited
US2388673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-19 | 1953-12-19 | 1954-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-19 | 1957-12-19 | 1958-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-19 | 1961-12-19 | 1962-06-20 | $7700.00 | Window Closed / Lapsed |