US3376936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bypass valve for removing paraffin in oil wells
Assignee: Paraffin Tool and Equipment Co
•
Filing: 1966-12-13
•
Granted: 1968-04-09
•
Expires: 1986-12-13
Abstract
No abstract record available.
Inventors
- 👤 Dave R Tomlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:00
CPC Classifications
E; E21; E21B; E21B37/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1182083A
Cited
US1517611A
Cited
US2143251A
Cited
US2403987A
Cited
US3002724A
Cited
US3207219A
Cited
US3216452A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-09 | 1971-10-09 | 1972-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-09 | 1975-10-09 | 1976-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-09 | 1979-10-09 | 1980-04-09 | $7700.00 | Window Closed / Lapsed |