US3391739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for well flow stimulation
Assignee: Dresser Industries Inc
•
Filing: 1965-06-30
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Granted: 1968-07-09
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Expires: 1985-06-30
Abstract
No abstract record available.
Inventors
- 👤 Alexis A Venghiattis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:31
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/138; E21B27/00; E21B27/02; E21B43/00; E21B43/25; E21B43/26; E21B43/267
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-09 | 1972-01-08 | 1972-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-09 | 1976-01-08 | 1976-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-09 | 1980-01-08 | 1980-07-09 | $7700.00 | Window Closed / Lapsed |