US2825411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circulating swabs for wells
Assignee: Individual
•
Filing: 1953-10-29
•
Granted: 1958-03-04
•
Expires: 1973-10-29
Abstract
No abstract record available.
Inventors
- 👤 Keltner Amos Lea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:06
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/10; E03; E03B; E03B3/00; E03B3/06; E03B3/08; E03B3/15
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-03 | 1961-09-02 | 1962-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-03 | 1965-09-02 | 1966-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-03 | 1969-09-02 | 1970-03-04 | $7700.00 | Window Closed / Lapsed |