US2551355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling fluid
Assignee: Texaco Development Corp
•
Filing: 1948-06-24
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Granted: 1951-05-01
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Expires: 1968-06-24
Abstract
No abstract record available.
Inventors
- 👤 Walter J Weiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:20
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
AN AQUEOUS DRILLING FLUID CONTAINING REACTION PRODUCTS IN AQUEOUS SOLUTION OF AN ALKALI METAL POLYPHOSPHATE AND A COMPOUND CONTAINING A HEAVY METAL ION SELECTED FROM THE GROUP CONSISTING OF TITANIUM, CHROMIUM, MANGANESE, IRON, COBALT, CADMIUM, TIN AND LEAD, IN AMOUNTS SUFFICIENT TO CONTROL THE VISCOSITY OF THE FLUID, SAID COMPOUNDS BEING USED IN APPROXIMATELY STOICHIOMETRIC PROPORTIONS TO FORM A COMPLEX ALKALI METAL HEAVY METAL POLYPHOSPHATE.
Claim 2
Dependent Claim
65 words
AN AQUEOUS DRILLING FLUID CONTAINING REACTION PRODUCTS IN AQUEOUS SOLUTION OF AN ALKALI METAL POLYPHOSPHATE AND A COMPOUND CONTAINING A HEAVY METAL ION SELECTED FROM THE GROUP CONSISTING OF TITANIUM, CHROMIUM, MANGANESE, IRON, COBALT, CADMIUM, TIN AND LEAD, IN AMOUNTS SUFFICIENT TO CONTROL THE VISCOSITY OF THE FLUID, SAID COMPOUNDS BEING USED IN APPROXIMATELY STOICHIOMETRIC PROPORTIONS TO FORM A COMPLEX ALKALI METAL HEAVY METAL POLYPHOSPHATE.
References Cited (Backward Citations)
US2235955A
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US2324124A
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US2370472A
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US2294877A
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US2365489A
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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) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |