Patent US1897492A successfully refreshed from Google Patents.
US1897492A
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Flow controller
Assignee: Simplex Valve & Meter Co
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Filing: 1927-08-03
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Granted: 1933-02-14
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Expires: 1947-08-03
Abstract
No abstract record available.
Inventors
- 👤 John W Ledoux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:19
CPC Classifications
G; G05; G05D; G05D11/00; G05D11/006; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7358; Y10T137/7423; Y10T137/7426; Y10T137/7436; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7837; Y10T137/7854; Y10T137/7857; Y10T137/8158; Y10T137/8359; Y10T137/8593; Y10T137/87265; Y10T137/87338; Y10T137/87354; Y10T137/87539; Y10T137/87555
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1936-02-14 | 1936-08-15 | 1937-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-02-14 | 1940-08-15 | 1941-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-02-14 | 1944-08-15 | 1945-02-14 | $7700.00 | Window Closed / Lapsed |