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Patent US646428A successfully refreshed from Google Patents.
US646428A
Expired / Lapsed
US
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Pressure-reducing valve.
Assignee: Individual
•
Filing: 1899-04-03
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Granted: 1900-04-03
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Expires: 1919-04-03
Abstract
No abstract record available.
Inventors
- 👤 Robert Hardie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:17
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/40; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1789; Y10T137/7722; Y10T137/7781; Y10T137/7793; Y10T137/7801; Y10T137/7809; Y10T137/782
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) | 1903-04-03 | 1903-10-03 | 1904-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1907-04-03 | 1907-10-03 | 1908-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1911-04-03 | 1911-10-03 | 1912-04-03 | $7700.00 | Window Closed / Lapsed |