Patent US1829022A successfully refreshed from Google Patents.
US1829022A
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US
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Method of constructing valve cages
Assignee: Emsco Derrick and Equipment Co
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Filing: 1930-01-03
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Granted: 1931-10-27
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Expires: 1950-01-03
Abstract
No abstract record available.
Inventors
- 👤 Edward E Stevenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:26
CPC Classifications
F; F16; F16K; F16K27/00; F16K27/02; Y; Y10; Y10S; Y10S29/00; Y10S29/026; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/791; Y10T137/7912; Y10T29/00; Y10T29/49; Y10T29/49405; Y10T29/49426
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) | 1934-10-26 | 1935-04-27 | 1935-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-10-26 | 1939-04-27 | 1939-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-10-26 | 1943-04-27 | 1943-10-27 | $7700.00 | Window Closed / Lapsed |