Patent US3520362A successfully refreshed from Google Patents.
US3520362A
Expired / Lapsed
US
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Well stimulation method
Assignee: Hughes Tool Co
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Filing: 1967-08-04
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Granted: 1970-07-14
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Expires: 1987-08-04
Abstract
No abstract record available.
Inventors
- 👤 Edward M Galle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:07
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/003; E21B28/00
Claims Analysis
Total Claims: 0
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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) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |