US2877852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well filters
Assignee: Individual
•
Filing: 1954-09-20
•
Granted: 1959-03-17
•
Expires: 1974-09-20
Abstract
No abstract record available.
Inventors
- 👤 Frank J Bashara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:14
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US71144A
Cited
US1356187A
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US1229437A
Cited
US1291288A
Cited
US1898027A
Cited
US2321985A
Cited
US2448157A
Cited
US2530223A
Cited
US2703650A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-16 | 1962-09-15 | 1963-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-16 | 1966-09-15 | 1967-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-16 | 1970-09-15 | 1971-03-17 | $7700.00 | Window Closed / Lapsed |