US2465237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of oil wells
Assignee: Individual
•
Filing: 1937-03-31
•
Granted: 1949-03-22
•
Expires: 1957-03-31
Abstract
No abstract record available.
Inventors
- 👤 Delmar H Larsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:50
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/584; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2267548A
Cited
US1823440A
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US1822271A
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US1894759A
Cited
US2028091A
Cited
US2024718A
Cited
US2024119A
Cited
US2262428A
Cited
US2050933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-03-21 | 1952-09-20 | 1953-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-03-21 | 1956-09-20 | 1957-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-03-21 | 1960-09-20 | 1961-03-22 | $7700.00 | Window Closed / Lapsed |