Patent US2622735A successfully refreshed from Google Patents.
US2622735A
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Vortex control system
Assignee: Heyl and Patterson Inc
•
Filing: 1949-09-09
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Granted: 1952-12-23
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Expires: 1969-09-09
Abstract
No abstract record available.
Inventors
- 👤 Harry E Criner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:01
CPC Classifications
B; B04; B04C; B04C11/00; B04C5/00; B04C5/14; B04C5/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US453105A
Cited
US762866A
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US1197946A
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US2010128A
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US1919653A
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US2069483A
Cited
US2360355A
Cited
CH238137A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-23 | 1956-06-23 | 1956-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-23 | 1960-06-23 | 1960-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-23 | 1964-06-23 | 1964-12-23 | $7700.00 | Window Closed / Lapsed |