US1779637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam-operated emergency valve for oil and gas wells
Assignee: Individual
•
Filing: 1930-05-02
•
Granted: 1930-10-28
•
Expires: 1950-05-02
Abstract
No abstract record available.
Inventors
- 👤 Sydney C Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:25
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/122; E; E21; E21B; E21B34/00; E21B34/02
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) | 1933-10-27 | 1934-04-28 | 1934-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-10-27 | 1938-04-28 | 1938-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-10-27 | 1942-04-28 | 1942-10-28 | $7700.00 | Window Closed / Lapsed |