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Patent US2684690A successfully refreshed from Google Patents.
US2684690A
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Flow control apparatus
Assignee: Paper Patents Co
•
Filing: 1949-10-01
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Granted: 1954-07-27
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Expires: 1969-10-01
Abstract
No abstract record available.
Inventors
- 👤 Charles A Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:42
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/02; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87265; Y10T137/8741; Y10T137/87442; Y10T137/87467
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR883437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-26 | 1958-01-25 | 1958-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-26 | 1962-01-25 | 1962-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-26 | 1966-01-25 | 1966-07-27 | $7700.00 | Window Closed / Lapsed |