US2701683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interengaging rotor blower
Assignee: Read Standard Corp
•
Filing: 1951-12-15
•
Granted: 1955-02-08
•
Expires: 1971-12-15
Abstract
No abstract record available.
Inventors
- 👤 Joseph E Whitfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:22
CPC Classifications
F; F04; F04C; F04C18/00; F04C18/08; F04C18/082; F04C18/084
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US502102A
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US514659A
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FR763458A
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US709968A
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FR698575A
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US2014932A
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US2078334A
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GB527339A
Cited
US2382042A
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US2462924A
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US2530173A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-07 | 1958-08-09 | 1959-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-07 | 1962-08-09 | 1963-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-07 | 1966-08-09 | 1967-02-08 | $7700.00 | Window Closed / Lapsed |