US2543828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for controlling the injection of fluids
Assignee: Standard Oil Development Co
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Filing: 1949-03-30
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Granted: 1951-03-06
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Expires: 1969-03-30
Abstract
No abstract record available.
Inventors
- 👤 Stephen S Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:02
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/068; E21B41/00; E21B41/02; F; F04; F04B; F04B49/00; F04B49/16; F04B53/00; F04B53/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |