US2203577A
Expired / Lapsed
US
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Means for measuring and controlling fluid pressures
Assignee: MORDICA O JOHNSTON
•
Filing: 1938-01-03
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Granted: 1940-06-04
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Expires: 1958-01-03
Abstract
No abstract record available.
Inventors
- 👤 Frank E O'neill
- 👤 Rowland G Whealton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:28
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/06; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/7913; Y10T137/7914; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86734
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) | 1943-06-04 | 1943-12-04 | 1944-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-06-04 | 1947-12-04 | 1948-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-06-04 | 1951-12-04 | 1952-06-04 | $7700.00 | Window Closed / Lapsed |