US2134428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for exploring the level of liquid in a bore hole
Assignee: ENGINEERING LAB Inc
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Filing: 1937-07-24
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Granted: 1938-10-25
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Expires: 1957-07-24
Abstract
No abstract record available.
Inventors
- 👤 Scherbatskoy Serge Alexander
- 👤 Neufeld Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:43
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/30; E; E21; E21B; E21B47/00; E21B47/04; E21B47/047; Y; Y10; Y10S; Y10S116/00; Y10S116/19
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) | 1941-10-24 | 1942-04-25 | 1942-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-10-24 | 1946-04-25 | 1946-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-10-24 | 1950-04-25 | 1950-10-25 | $7700.00 | Window Closed / Lapsed |