US2193144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming mud seals
Assignee: Individual
•
Filing: 1939-05-25
•
Granted: 1940-03-12
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Expires: 1959-05-25
Abstract
No abstract record available.
Inventors
- 👤 Hazen L Rymal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:32
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/138; C; C09; C09K; C09K8/00; C09K8/42
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) | 1943-03-12 | 1943-09-11 | 1944-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-03-12 | 1947-09-11 | 1948-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-03-12 | 1951-09-11 | 1952-03-12 | $7700.00 | Window Closed / Lapsed |