Patent US2836555A successfully refreshed from Google Patents.
US2836555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Material for recovering lost circulation in wells
Assignee: Individual
•
Filing: 1956-07-30
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Granted: 1958-05-27
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Expires: 1976-07-30
Abstract
No abstract record available.
Inventors
- 👤 Arthur L Armentrout
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:57
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/516; Y; Y10; Y10S; Y10S507/00; Y10S507/902; Y10S507/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
AS A NEW ARTICLE OF MANUFACTURE, A PELLET CONTAINING COMPRESSED, DEHYDRATED, EXPANDABLE BENTONITE CLAY COATED WITH A WATER INSOLUBLE COATING WHICH IS IMPERVIOUS TO THE INGRESS OF WATER EXCEPT AT A RESTRICTED ENTRANCE, WHEREBY THE PELLET MAY BE INTRODUCED INTO A WATER CONTAINING MIXTURE, PUMP INTO A WELL, AND INGRESS OF WATER TO THE CLAY WITHIN THE COATING TO AN EXTENT WHICH WILL CAUSE THE CLAY TO EXPAND AND RUPTURE THE PELLET WILL BE DELAYED UNTIL THE PELLET HAS HAD AN ADEQUATE OPPORTUNITY TO BE CARRIED BY THE MIXTURE TO THE DESIRED LOCALITY AFTER WHICH THE CLAY MAY ABSORB WATER, SWELL, AND RUPTURE THE PELLET EXPOSING MORE OF THE CLAY TO WATER ABSORPTION AND SWELLING.
Claim 2
Dependent Claim
115 words
AS A NEW ARTICLE OF MANUFACTURE, A PELLET CONTAINING COMPRESSED, DEHYDRATED, EXPANDABLE BENTONITE CLAY COATED WITH A WATER INSOLUBLE COATING WHICH IS IMPERVIOUS TO THE INGRESS OF WATER EXCEPT AT A RESTRICTED ENTRANCE, WHEREBY THE PELLET MAY BE INTRODUCED INTO A WATER CONTAINING MIXTURE, PUMP INTO A WELL, AND INGRESS OF WATER TO THE CLAY WITHIN THE COATING TO AN EXTENT WHICH WILL CAUSE THE CLAY TO EXPAND AND RUPTURE THE PELLET WILL BE DELAYED UNTIL THE PELLET HAS HAD AN ADEQUATE OPPORTUNITY TO BE CARRIED BY THE MIXTURE TO THE DESIRED LOCALITY AFTER WHICH THE CLAY MAY ABSORB WATER, SWELL, AND RUPTURE THE PELLET EXPOSING MORE OF THE CLAY TO WATER ABSORPTION AND SWELLING.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-26 | 1961-11-25 | 1962-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-26 | 1965-11-25 | 1966-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-26 | 1969-11-25 | 1970-05-27 | $7700.00 | Window Closed / Lapsed |