Patent US4340678A successfully refreshed from Google Patents.
US4340678A
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Xanthomonas biopolymer for use in displacement of oil from partially depleted reservoirs
Assignee: OFPG
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Filing: 1981-01-05
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Granted: 1982-07-20
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Expires: 2001-01-05
Abstract
Abstract A mutant strain of the genus Xanthomonas produces a pyruvate-free biopolymer. This biopolymer and the deacetylated form of this new biopolymer provide mobility control solutions which are especially useful for enhanced oil recovery where high brine applications are involved. The mobility control solutions of the present invention may be made from whole or filtered fermentation broth containing the pyruvate-free biopolymer or its deacetylated form. Alternatively, the biopolymer or its deacetylated form may be recovered from the broth and the recovered product used to form the desired mobility control solutions.
Inventors
- 👤 William C. Wernau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:27
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/588; C08; C08B; C08B37/00; C08B37/0006; C08B37/0024; C08B37/0033; C09K8/60; C09K8/84; C09K8/86; C09K8/88; C09K8/90; C09K8/905; C12; C12P; C12P19/00; C12P19/04; C12P19/06; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/91; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
4 words
Pyruvate-free xanthan-containing fermentation broth.
Claim 2
Dependent Claim
4 words
Pyruvate-free xanthan-containing fermentation broth.
Claim 3
Dependent Claim
5 words
Deacetylated pyruvate-free xanthan-containing fermentation broth.
Claim 4
Dependent Claim
5 words
Deacetylated pyruvate-free xanthan-containing fermentation broth.
Claim 5
Dependent Claim
2 words
Pyruvate-free xanthan.
Claim 6
Dependent Claim
2 words
Pyruvate-free xanthan.
Claim 7
Dependent Claim
3 words
Deacetylated pyruvate-free xanthan.
Claim 8
Dependent Claim
3 words
Deacetylated pyruvate-free xanthan.
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) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |