US2463420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deep well drilling device
Assignee: Individual
•
Filing: 1945-09-24
•
Granted: 1949-03-01
•
Expires: 1965-09-24
Abstract
No abstract record available.
Inventors
- 👤 Prassel Victor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:31
CPC Classifications
E; E21; E21B; E21B23/00; E21B4/00; E21B4/02; E21B7/00; Y; Y10; Y10S; Y10S408/00; Y10S408/702; Y10T; Y10T408/00; Y10T408/55; Y10T408/557; Y10T408/558; Y10T408/5583; Y10T408/5586; Y10T408/65
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US494779A
Cited
US1315422A
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US1188001A
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US1348325A
Cited
US1380203A
Cited
US1514156A
Cited
US1668034A
Cited
US1858926A
Cited
US2091779A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-02-29 | 1952-08-30 | 1953-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-29 | 1956-08-30 | 1957-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-29 | 1960-08-30 | 1961-03-01 | $7700.00 | Window Closed / Lapsed |