Patent US2931503A successfully refreshed from Google Patents.
US2931503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conditioning paper-making stock
Assignee: Clark and Vicario Corp
•
Filing: 1953-04-21
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Granted: 1960-04-05
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Expires: 1973-04-21
Abstract
No abstract record available.
Inventors
- 👤 Clark Carleton Leggett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:59
CPC Classifications
D; D21; D21D; D21D5/00; D21D5/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2312706A
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US2377524A
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US2528032A
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US2614656A
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US2685937A
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US2642950A
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US2816490A
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US2849930A
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US2717536A
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US2878934A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |