Patent US2557691A successfully refreshed from Google Patents.
US2801566A
Expired / Lapsed
US
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Apparatus for making photographic negatives
Assignee: Allen B du Mont Laboratories Inc
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Filing: 1954-04-07
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Granted: 1957-08-06
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Expires: 1974-04-07
Abstract
No abstract record available.
Inventors
- 👤 Roland D Eaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:57
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271; H01J9/2272; Y; Y10; Y10S; Y10S430/00; Y10S430/152
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE293003C
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DE222485C
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US727816A
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GB401511A
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US2169838A
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US2393308A
Cited
US2641963A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |