Patent US2188761A successfully refreshed from Google Patents.
US2188761A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for controlling the flow of liquids
Assignee: QUIET FLOW DEVICES Inc
•
Filing: 1937-07-15
•
Granted: 1940-01-30
•
Expires: 1957-07-15
Abstract
No abstract record available.
Inventors
- 👤 Walker F Peterson
- 👤 Albert U Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:59
CPC Classifications
E; E03; E03D; E03D9/00; E03D9/14; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3149; Y10T137/3185; Y10T137/3294; Y10T137/8593; Y10T137/86292
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1943-01-29 | 1943-07-31 | 1944-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-01-29 | 1947-07-31 | 1948-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-01-29 | 1951-07-31 | 1952-01-30 | $7700.00 | Window Closed / Lapsed |