Patent US2807998A successfully refreshed from Google Patents.
US2807998A
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Separation apparatus
Assignee: EIDP Inc
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Filing: 1955-02-24
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Granted: 1957-10-01
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Expires: 1975-02-24
Abstract
No abstract record available.
Inventors
- 👤 Stephan Paul Glenn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:05
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/66; B; B01; B01D; B01D33/00; B01D33/06; B01D33/073; B01D33/35; B01D33/37; B01D33/58; B01D33/68; D21C; D21C9/00; D21C9/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |