US2128253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic lock dry pipe valve with well testing and well flowing apparatus
Assignee: Individual
•
Filing: 1937-08-31
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Granted: 1938-08-30
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Expires: 1957-08-31
Abstract
No abstract record available.
Inventors
- 👤 Arthur E Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:16
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/08; E21B49/081; E21B34/00; E21B34/06; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1654; Y10T137/7722; Y10T137/7837; Y10T137/785; Y10T137/7852; Y10T137/7853
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) | 1941-08-29 | 1942-02-28 | 1942-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-08-29 | 1946-02-28 | 1946-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-08-29 | 1950-02-28 | 1950-08-30 | $7700.00 | Window Closed / Lapsed |