Patent US1537201A successfully refreshed from Google Patents.
Patent US3515210A successfully refreshed from Google Patents.
US3515210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter apparatus for well tool string
Assignee: Halliburton Co
•
Filing: 1968-06-20
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Granted: 1970-06-02
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Expires: 1988-06-20
Abstract
No abstract record available.
Inventors
- 👤 Lee E Perkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:42
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/08; E21B43/082; E21B43/086
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2793752A
Cited
US2963163A
Cited
US3033783A
Cited
US3314481A
Cited
US3355021A
Cited
US3369665A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |