US1764213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductor for oil-well heaters
Assignee: Individual
•
Filing: 1927-02-21
•
Granted: 1930-06-17
•
Expires: 1947-02-21
Abstract
No abstract record available.
Inventors
- 👤 Knox George Washington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:35
CPC Classifications
E; E21; E21B; E21B36/00; E21B36/04; Y; Y10; Y10S; Y10S415/00; Y10S415/901
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) | 1933-06-16 | 1933-12-16 | 1934-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-06-16 | 1937-12-16 | 1938-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-06-16 | 1941-12-16 | 1942-06-17 | $7700.00 | Window Closed / Lapsed |