Patent US2957580A successfully refreshed from Google Patents.
US2957580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filters
Assignee: Individual
•
Filing: 1955-10-03
•
Granted: 1960-10-25
•
Expires: 1975-10-03
Abstract
No abstract record available.
Inventors
- 👤 Charles E Hunziker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:13
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/39
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR647095A
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US2087775A
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US2216921A
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US2342035A
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US2347092A
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US2584394A
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US2595913A
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US2584395A
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US2591720A
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US2661244A
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US2620927A
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US2701235A
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US2679936A
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US2705221A
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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) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |