US3361203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-cleaning sand screen
Assignee: Halliburton Co
•
Filing: 1965-10-22
•
Granted: 1968-01-02
•
Expires: 1985-10-22
Abstract
No abstract record available.
Inventors
- 👤 Roger F Rensvold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:55
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/02; E21B43/08; E21B43/082
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
65 words
A METHOD OF INCREASING THE PERMEABILITY OF A SAND SCREEN HAVING TWO LAYERS, AN INNER LAYER AND AN OUTER LAYER, SAID OUTER LAYER COMPRISING SAND IN A SEMIPERMANENT BINDER, SAID INNER LAYER COMPRISING SAND IN A PERMANENT BINDER WHICH COMPRISES CONTACTING SAID SAND SCREEN WITH A REAGENT WHICH WILL SUBSTANTIALLY WEAKEN SAID SEMIPERMANENT BINDER BUT WHICH WILL HAVE ESSENTIALLY NO EFFECT ON SAID PERMANENT BINDER.
References Cited (Backward Citations)
US3273641A
Cited
US2401035A
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FR1020910A
Cited
US2981333A
Cited
US3044547A
Cited
SU144802A1
Cited
US3195226A
Cited
US3268001A
Cited
US3299831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-01 | 1971-07-03 | 1972-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-01 | 1975-07-03 | 1976-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-01 | 1979-07-03 | 1980-01-02 | $7700.00 | Window Closed / Lapsed |