US2214811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liner perforator and undercutter
Assignee: LEO T LANGER
•
Filing: 1938-09-13
•
Granted: 1940-09-17
•
Expires: 1958-09-13
Abstract
No abstract record available.
Inventors
- 👤 Andrew J Colmerauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:06
CPC Classifications
E; E21; E21B; E21B29/00; Y; Y10; Y10S; Y10S29/00; Y10S29/088; Y10T; Y10T408/00; Y10T408/36; Y10T408/38; Y10T408/3806; Y10T408/3809; Y10T408/3833
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) | 1943-09-17 | 1944-03-18 | 1944-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-09-17 | 1948-03-18 | 1948-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-09-17 | 1952-03-18 | 1952-09-17 | $7700.00 | Window Closed / Lapsed |