Patent US2701683A successfully refreshed from Google Patents.
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 10:32
CPC Classifications
F; F04; F04C; F04C18/00; F04C18/08; F04C18/082; F04C18/084
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US502102A
Cited
US514659A
Cited
FR763458A
Cited
US709968A
Cited
FR698575A
Cited
US2014932A
Cited
US2078334A
Cited
GB527339A
Cited
US2382042A
Cited
US2462924A
Cited
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 |