Patent US2541289A successfully refreshed from Google Patents.
US2541289A
Expired / Lapsed
US
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Assignee: Individual
•
Filing: 1948-08-19
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Granted: 1951-02-13
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Expires: 1968-08-19
Abstract
No abstract record available.
Inventors
- 👤 Paul J M Richartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:24
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US464904A
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US492734A
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US1642818A
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US2150696A
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US2168998A
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US2168974A
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US2241122A
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US2406366A
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US2367504A
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US2398412A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |