US2227347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Whipstock
Assignee: Individual
•
Filing: 1939-06-16
•
Granted: 1940-12-31
•
Expires: 1959-06-16
Abstract
No abstract record available.
Inventors
- 👤 Johnson Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:29
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/01; E21B23/04; E21B23/0411; E21B23/0414; E21B23/042; E21B29/00; E21B7/00; E21B7/04; E21B7/06; E21B7/061; Y; Y10; Y10S; Y10S30/00; Y10S30/04; Y10T; Y10T29/00; Y10T29/53; Y10T29/53796; Y10T29/53839
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) | 1943-12-31 | 1944-07-01 | 1944-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-12-31 | 1948-07-01 | 1948-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-12-31 | 1952-07-01 | 1952-12-31 | $7700.00 | Window Closed / Lapsed |