US750428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casing-head and tubing-anchor
Assignee: —
•
Filing: —
•
Granted: 1904-01-26
•
Expires: 1921-01-26
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:06
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04
Claims Analysis
Total Claims: 0
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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) | 1907-01-25 | 1907-07-27 | 1908-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1911-01-25 | 1911-07-27 | 1912-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1915-01-25 | 1915-07-27 | 1916-01-26 | $7700.00 | Window Closed / Lapsed |