Patent US2973188A successfully refreshed from Google Patents.
US2973188A
Expired / Lapsed
US
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Mixing apparatus
Assignee: KEYSTONE Manufacturing Co
•
Filing: 1957-06-06
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Granted: 1961-02-28
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Expires: 1977-06-06
Abstract
No abstract record available.
Inventors
- 👤 Howe Russell Rex
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:16
CPC Classifications
B; B01; B01F; B01F27/00; B01F27/05; B01F27/11; B01F27/115; B01F33/00; B01F33/50; B01F33/501; B01F33/5011; B01F35/00; B01F35/30; B01F35/32; B01F35/32005; B01F35/3204
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US813497A
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FR386579A
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US941948A
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US1592231A
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US2082752A
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US2185846A
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US2672635A
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US2539017A
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US2758915A
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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) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |