US2650194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling composition and method of manufacture thereof
Assignee: Columbia Southern Chemical Corp
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Filing: 1949-09-07
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Granted: 1953-08-25
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Expires: 1969-09-07
Abstract
No abstract record available.
Inventors
- 👤 Henry W Rahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:52
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/203; C09K8/03; C09K8/035
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A SOLID GRANULAR WELL-TREATING COMPOSITION PRODUCED BY HEATING AN AQUEOUS LIQUID MIXTURE OF AN ALKALI METAL HYDROXIDE AND A TANNIN AT A TEMPERATURE OF 250 TO 650* F., UNTIL A SOLID REACTION PRODUCT HAS BEEN OBTAINED, THE AMOUNT OF ALKALI METAL HYDROXIDE IN SAID COMPOSITION BEING SUBSTANTIALLY IN EXCESS OF THAT REQUIRED TO REACT WITH THE TANNIN TO PRODUCE A NEUTRAL PRODUCT.
Claim 2
Dependent Claim
62 words
A SOLID GRANULAR WELL-TREATING COMPOSITION PRODUCED BY HEATING AN AQUEOUS LIQUID MIXTURE OF AN ALKALI METAL HYDROXIDE AND A TANNIN AT A TEMPERATURE OF 250 TO 650* F., UNTIL A SOLID REACTION PRODUCT HAS BEEN OBTAINED, THE AMOUNT OF ALKALI METAL HYDROXIDE IN SAID COMPOSITION BEING SUBSTANTIALLY IN EXCESS OF THAT REQUIRED TO REACT WITH THE TANNIN TO PRODUCE A NEUTRAL PRODUCT.
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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) | 1956-08-24 | 1957-02-23 | 1957-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-24 | 1961-02-23 | 1961-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-24 | 1965-02-23 | 1965-08-25 | $7700.00 | Window Closed / Lapsed |