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Patent US2431520A successfully refreshed from Google Patents.
US2431520A
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Photoprinting machine
Assignee: Bruning Charles Co Inc
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Filing: 1945-02-20
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Granted: 1947-11-25
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Expires: 1965-02-20
Abstract
No abstract record available.
Inventors
- 👤 Paul B Streich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:46
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/02; G03B27/14; G03B27/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1790881A
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US2308130A
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US2311849A
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US2315829A
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US2373040A
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US2351339A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-11-24 | 1951-05-26 | 1951-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-24 | 1955-05-26 | 1955-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-24 | 1959-05-26 | 1959-11-25 | $7700.00 | Window Closed / Lapsed |