Patent US2307728A successfully refreshed from Google Patents.
Patent US2609880A successfully refreshed from Google Patents.
US2609880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for sealing wells
Assignee: Individual
•
Filing: 1948-03-04
•
Granted: 1952-09-09
•
Expires: 1968-03-04
Abstract
No abstract record available.
Inventors
- 👤 Joseph G Dyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:04
CPC Classifications
E; E21; E21B; E21B27/00; E21B27/02; B; B65; B65D; B65D81/00; B65D81/32; B65D81/3261; C; C04; C04B; C04B40/00; C04B40/06; Y; Y10; Y10S; Y10S206/00; Y10S206/806
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US454082A
Cited
US1807819A
Cited
US1190024A
Cited
US1393311A
Cited
US1562123A
Cited
US1934701A
Cited
US1912578A
Cited
US2373006A
Cited
US2352805A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-09 | 1956-03-10 | 1956-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-09 | 1960-03-10 | 1960-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-09 | 1964-03-10 | 1964-09-09 | $7700.00 | Window Closed / Lapsed |