Patent US2539990A successfully refreshed from Google Patents.
US2539990A
Expired / Lapsed
US
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Expansive fiber separator
Assignee: Individual
•
Filing: 1946-11-14
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Granted: 1951-01-30
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Expires: 1966-11-14
Abstract
No abstract record available.
Inventors
- 👤 Robert S Chapman
- 👤 Byron B Siebenhaar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:58
CPC Classifications
D; D21; D21B; D21B1/00; D21B1/04; D21B1/12; D21B1/30; D21B1/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1480170A
Cited
US1578306A
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US1578609A
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US1824221A
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AU3029530A
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US2116212A
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US2086266A
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US2132987A
Cited
US2279868A
Cited
US2362870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-29 | 1954-07-31 | 1955-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-29 | 1958-07-31 | 1959-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-29 | 1962-07-31 | 1963-01-30 | $7700.00 | Window Closed / Lapsed |