US2351322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bottom hole regulator
Assignee: Shell Development Co
•
Filing: 1942-01-13
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Granted: 1944-06-13
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Expires: 1962-01-13
Abstract
No abstract record available.
Inventors
- 👤 Crake Wilfred St Maur Elmore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:12
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/08; C; C09; C09K; C09K8/00; C09K8/58; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7793; Y10T137/7822
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) | 1947-06-13 | 1947-12-13 | 1948-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-06-13 | 1951-12-13 | 1952-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-06-13 | 1955-12-13 | 1956-06-13 | $7700.00 | Window Closed / Lapsed |