Patent US2538475A successfully refreshed from Google Patents.
US2538475A
Expired / Lapsed
US
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Surveyor's illuminated backsight
Assignee: Individual
•
Filing: 1948-08-13
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Granted: 1951-01-16
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Expires: 1968-08-13
Abstract
No abstract record available.
Inventors
- 👤 Jr Frederick J Skrastin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:02
CPC Classifications
G; G01; G01C; G01C15/00; G01C15/02; F; F21; F21L; F21L4/00; F21L4/005
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) | 1954-01-15 | 1954-07-17 | 1955-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-15 | 1958-07-17 | 1959-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-15 | 1962-07-17 | 1963-01-16 | $7700.00 | Window Closed / Lapsed |