Patent US3374664A successfully refreshed from Google Patents.
US3374664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for measuring porefluid pressures
Assignee: Diamond Shamrock Corp
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Filing: 1966-06-01
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Granted: 1968-03-26
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Expires: 1986-06-01
Abstract
No abstract record available.
Inventors
- 👤 Joseph R Lefelhocz
- 👤 Jr Cletus E Peeler
- 👤 Allan D Bergmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:01
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/08; G01N15/0806
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
IN AN APPARATUS FOR DETERMINING PORE-FLUID PRESSURES COMPRISING A HOLLOW, POROUS TUBE HAVING A STOPPER IN ONE END AND A RISER TUBE EXTENDING FROM ITS OTHER END, THE IMPROVEMENT WHICH CONSISTS IN PROVIDING SAID POROUS TUBE WITH A COVERING OF A FLEXIBLE, CORROSION RESISTANT, FLUIDPERMEABLE SCREEN.
Claim 2
Dependent Claim
46 words
IN AN APPARATUS FOR DETERMINING PORE-FLUID PRESSURES COMPRISING A HOLLOW, POROUS TUBE HAVING A STOPPER IN ONE END AND A RISER TUBE EXTENDING FROM ITS OTHER END, THE IMPROVEMENT WHICH CONSISTS IN PROVIDING SAID POROUS TUBE WITH A COVERING OF A FLEXIBLE, CORROSION RESISTANT, FLUIDPERMEABLE SCREEN.
References Cited (Backward Citations)
US3091115A
Cited
US3146617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-26 | 1971-09-25 | 1972-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-26 | 1975-09-25 | 1976-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-26 | 1979-09-25 | 1980-03-26 | $7700.00 | Window Closed / Lapsed |