US2475429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wellhead
Assignee: E E TOWNES
•
Filing: 1945-10-01
•
Granted: 1949-07-05
•
Expires: 1965-10-01
Abstract
No abstract record available.
Inventors
- 👤 Granville A Humason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:15
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)
US37929A
Cited
US303231A
Cited
US1662984A
Cited
US2075878A
Cited
US2075899A
Cited
US2134311A
Cited
US2243340A
Cited
US2222082A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-07-04 | 1953-01-03 | 1953-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-04 | 1957-01-03 | 1957-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-04 | 1961-01-03 | 1961-07-05 | $7700.00 | Window Closed / Lapsed |