Patent US2704579A successfully refreshed from Google Patents.
US2704579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
brown
Assignee: —
•
Filing: —
•
Granted: 1955-03-22
•
Expires: 1972-03-22
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:37
CPC Classifications
E; E21; E21B; E21B43/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1909589A
Cited
US2211845A
Cited
US2129433A
Cited
US2162179A
Cited
US2148327A
Cited
US2241288A
Cited
US2294061A
Cited
US2498791A
Cited
US2495642A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-03-21 | 1958-09-20 | 1959-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-21 | 1962-09-20 | 1963-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-21 | 1966-09-20 | 1967-03-22 | $7700.00 | Window Closed / Lapsed |