US2423539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Polaroid Corp
•
Filing: 1945-04-19
•
Granted: 1947-07-08
•
Expires: 1965-04-19
Abstract
No abstract record available.
Inventors
- 👤 Charles W Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:04
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/10; G02C7/105; G02C7/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1249908A
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US1503868A
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US1624337A
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US1723474A
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US1899905A
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US2192092A
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US2187810A
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US2337617A
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US2257812A
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US2334446A
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US2368750A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-07 | 1951-01-06 | 1951-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-07 | 1955-01-06 | 1955-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-07 | 1959-01-06 | 1959-07-08 | $7700.00 | Window Closed / Lapsed |