Patent US3197716A successfully refreshed from Google Patents.
Patent US2213038A successfully refreshed from Google Patents.
US2213038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formation sealing composition
Assignee: Individual
•
Filing: 1938-06-27
•
Granted: 1940-08-27
•
Expires: 1958-06-27
Abstract
No abstract record available.
Inventors
- 👤 Vern W David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:04
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/10; C09; C09K; C09K8/00; C09K8/50; C09K8/504; C09K8/5045
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1943-08-27 | 1944-02-26 | 1944-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-08-27 | 1948-02-26 | 1948-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-08-27 | 1952-02-26 | 1952-08-27 | $7700.00 | Window Closed / Lapsed |