US2570892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing agents
Assignee: Sunoco Inc
•
Filing: 1949-02-24
•
Granted: 1951-10-09
•
Expires: 1969-02-24
Abstract
No abstract record available.
Inventors
- 👤 Chester N White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:28
CPC Classifications
C; C08; C08L; C08L61/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A SEALING AGENT COMPRISING IN STABLE ADMIXTURE A MINOR PROPORTION OF A POLYSACCHARIDE HAVING A MOLECULAR WEIGHT GREATER THAN ABOUT 5000 AND A MAJOR PROPORTION OF A NON-COLLOIDAL AQUEOUS SUSPENSION OF DISPERSED CONDENSATION-TYPE THERMOSETTING RESIN SELECTED FROM THE GROUP CONSISTING OF PHENOL-ALDEHYDE, CRESYLIC ACID-ALDEHYDE, MELAMINE-ALDEHYDE, UREA-ALDEHYDE, AND THIOUREA-ALDEHYDE RESIN, PARTIALLY CONDENSED TO THE INTERMEDIATE PLASTIC SOLID STAGE AT WHICH THE RESIN IS DISPERSIBLE IN WATER BY STIRRING WITHOUT THE AID OF AN EMULSIFYING AGENT FO FORM A NONCOLLOIDAL SUSPENSION, SAID AQUEOUS SUSPENSION BEING CHARACTERIZED BY ITS ABILITY, WHEN FORCED INTO A BED OF 100 MESH SAND, TO FORM A RESIN PLUG AT THE FACE OF THE BED, WHICH, UPON APPLICATION OF HEAT, WILL CONDENSE TO A HARD LAYER IMPERVIOUS TO DRILLING FLUID.
Claim 2
Dependent Claim
122 words
A SEALING AGENT COMPRISING IN STABLE ADMIXTURE A MINOR PROPORTION OF A POLYSACCHARIDE HAVING A MOLECULAR WEIGHT GREATER THAN ABOUT 5000 AND A MAJOR PROPORTION OF A NON-COLLOIDAL AQUEOUS SUSPENSION OF DISPERSED CONDENSATION-TYPE THERMOSETTING RESIN SELECTED FROM THE GROUP CONSISTING OF PHENOL-ALDEHYDE, CRESYLIC ACID-ALDEHYDE, MELAMINE-ALDEHYDE, UREA-ALDEHYDE, AND THIOUREA-ALDEHYDE RESIN, PARTIALLY CONDENSED TO THE INTERMEDIATE PLASTIC SOLID STAGE AT WHICH THE RESIN IS DISPERSIBLE IN WATER BY STIRRING WITHOUT THE AID OF AN EMULSIFYING AGENT FO FORM A NONCOLLOIDAL SUSPENSION, SAID AQUEOUS SUSPENSION BEING CHARACTERIZED BY ITS ABILITY, WHEN FORCED INTO A BED OF 100 MESH SAND, TO FORM A RESIN PLUG AT THE FACE OF THE BED, WHICH, UPON APPLICATION OF HEAT, WILL CONDENSE TO A HARD LAYER IMPERVIOUS TO DRILLING FLUID.
References Cited (Backward Citations)
US2069178A
Cited
US2245491A
Cited
US2245245A
Cited
US2349181A
Cited
US2370517A
Cited
US2457160A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-08 | 1955-04-09 | 1955-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-08 | 1959-04-09 | 1959-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-08 | 1963-04-09 | 1963-10-09 | $7700.00 | Window Closed / Lapsed |