Patent US2981171A successfully refreshed from Google Patents.
US2981171A
Expired / Lapsed
US
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Developer process and apparatus
Assignee: Bruning Charles Co Inc
•
Filing: 1958-03-06
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Granted: 1961-04-25
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Expires: 1978-03-06
Abstract
No abstract record available.
Inventors
- 👤 Hruby Joseph
- 👤 Sr Paul B Streich
- 👤 John L Tregay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:20
CPC Classifications
G; G03; G03D; G03D5/00; G03D5/06; G03D5/067
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US248731A
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CH137488A
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US1867594A
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US2241104A
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US2562457A
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US2605684A
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DE853262C
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GB758928A
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FR1110571A
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GB744243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |