US3443429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for well treatment and measurement
Assignee: Gulf Research and Development Co
•
Filing: 1967-01-09
•
Granted: 1969-05-13
•
Expires: 1987-01-09
Abstract
No abstract record available.
Inventors
- 👤 Paul L Terwilliger
- 👤 Francis M Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:52
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/06; E21B47/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2290075A
Cited
US2463427A
Cited
US2653990A
Cited
US2945265A
Cited
US3007988A
Cited
US3202754A
Cited
US3307401A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |