Patent US2571308A successfully refreshed from Google Patents.
US2571308A
Expired / Lapsed
US
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Paralleling lens system
Assignee: Northrop Grumman Corp
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Filing: 1950-07-03
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Granted: 1951-10-16
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Expires: 1970-07-03
Abstract
No abstract record available.
Inventors
- 👤 Philip H Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:22
CPC Classifications
G; G02; G02B; G02B13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190504366A
Cited
US853812A
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US1159233A
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GB126837A
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US1464655A
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US1479229A
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US1553211A
Cited
CH208207A
Cited
US2388031A
Cited
US2528468A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-15 | 1955-04-16 | 1955-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-15 | 1959-04-16 | 1959-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-15 | 1963-04-16 | 1963-10-16 | $7700.00 | Window Closed / Lapsed |