Patent US3853771A successfully refreshed from Google Patents.
US3853771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for dispersing cellular micro-organisms with chelating aqueous alkaline surfactant systems
Assignee: Shell USA Inc
•
Filing: 1973-03-29
•
Granted: 1974-12-10
•
Expires: 1993-03-29
Abstract
Abstract A contaminant composed of cellular micro-organism materials is dissolved or dispersed by contacting it with an aqueous solution containing at least one surfactant adapted to disperse the outer wall layers of micro-organism cells, at least one chelating agent adapted to disperse the inner wall layers of micro-organism cells and an alkali metal hydroxide adapted to enhance the dispersing action.
Inventors
- 👤 T Felmann
- 👤 H Carlile
- 👤 C Blankenhorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:18
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/84; C09K8/86; C09K8/88; C09K8/90; C09K8/905; C09K8/52; C09K8/524; Y; Y10; Y10S; Y10S507/00; Y10S507/927
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
59 words
A PROCESS FOR DISSOLVING OR DISPERSING CELLULAR MICROORGANISM MATERIALS, COMPRISING, CONTACTING SAID MATERIALS WITH AN AQUEOUS SOLUTION CONTAINING AT LEAST ONE SURFACTANT EFFECTIVE FOR DISPERSING OUTER WALL LAYERS OF MICRO-ORGANISM CELLS, AT LEAST ONE CHELATING AGENT EFFECTIVE FOR DISPERSING THE INNER ALL LAYERS OF MICRO-ORGANISM CELLS, AND AT LEAST ONE ALKALI METAL HYDROXIDE EFFECTIVE FOR ENHANCING SAID DISPERSING ACTIONS.
Claim 2
Dependent Claim
59 words
A PROCESS FOR DISSOLVING OR DISPERSING CELLULAR MICROORGANISM MATERIALS, COMPRISING, CONTACTING SAID MATERIALS WITH AN AQUEOUS SOLUTION CONTAINING AT LEAST ONE SURFACTANT EFFECTIVE FOR DISPERSING OUTER WALL LAYERS OF MICRO-ORGANISM CELLS, AT LEAST ONE CHELATING AGENT EFFECTIVE FOR DISPERSING THE INNER ALL LAYERS OF MICRO-ORGANISM CELLS, AND AT LEAST ONE ALKALI METAL HYDROXIDE EFFECTIVE FOR ENHANCING SAID DISPERSING ACTIONS.
Claim 3
Dependent Claim
27 words
The process of claim 1 in which said cellular micro-organism materials are disposed within a permeable structure; and said aqueous solution is injected into the permeable structure.
References Cited (Backward Citations)
US2777818A
Cited
US2877848A
Cited
US3482635A
Cited
US3528503A
Cited
US3529666A
Cited
US3547194A
Cited
US3696040A
Cited
US3684720A
Cited
US3700031A
Cited
US3688829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |