US3943083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well cementing composition containing polymaleic anhydride and having improved flow properties
Assignee: Calgon Corp
•
Filing: 1974-05-01
•
Granted: 1976-03-09
•
Expires: 1994-05-01
Abstract
Abstract Aqueous hydraulic cement compositions containing polymaleic anhydride as a flow-property-improving and turbulence-inducing additive and their use in cementing wells is disclosed.
Inventors
- 👤 Sally L. Adams
- 👤 Michael M. Cook
- 👤 Fred David Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:32
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/26; C04B24/2664; C09; C09K; C09K8/00; C09K8/42; C09K8/46
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
43 words
A well cementing composition consisting essentially of hydraulic cement in admixture with from about 0.01 to about 5.0 percent by weight, based on weight of hydraulic cement, of polymaleic anhydride having a weight average molecular weight of from about 200 to about 10,000.
Claim 2
Dependent Claim
43 words
A well cementing composition consisting essentially of hydraulic cement in admixture with from about 0.01 to about 5.0 percent by weight, based on weight of hydraulic cement, of polymaleic anhydride having a weight average molecular weight of from about 200 to about 10,000.
Claim 3
Dependent Claim
22 words
The composition of claim 1 wherein the weight average molecular weight of the polymaleic anhydride is from about 200 to about 1,500.
Claim 4
Dependent Claim
35 words
The composition of claim 1 wherein the said polymaleic anhydride is admixed with the hydraulic cement in an amount of from about 0.1 to about 2.0 percent by weight, based on weight of hydraulic cement.
Claim 5
Dependent Claim
84 words
An aqueous hydraulic cement slurry composition for use in cementing wells, having improved flow properties and being more readily induced to flow in turbulence, consisting essentially of dry hydraulic cement in admixture with from about 0.01 to about 5.0 percent by weight, based on weight of dry hydraulic cement, of polymaleic anhydride having a weight average molecular weight of from about 200 to about 10,000; and sufficient water to make a pumpable aqueous slurry which is capable of setting to form a monolithic solid.
Claim 6
Dependent Claim
84 words
An aqueous hydraulic cement slurry composition for use in cementing wells, having improved flow properties and being more readily induced to flow in turbulence, consisting essentially of dry hydraulic cement in admixture with from about 0.01 to about 5.0 percent by weight, based on weight of dry hydraulic cement, of polymaleic anhydride having a weight average molecular weight of from about 200 to about 10,000; and sufficient water to make a pumpable aqueous slurry which is capable of setting to form a monolithic solid.
Claim 7
Dependent Claim
22 words
The composition of claim 4 wherein the weight average molecular weight of the polymaleic anhydride is from about 200 to about 1,500.
Claim 8
Dependent Claim
36 words
The composition of claim 4 wherein the said polymaleic anhydride is admixed with the hydraulic cement in an amount of from about 0.1 to about 2.0 percent by weight, based on weight of dry hydraulic cement.
Claim 9
Dependent Claim
30 words
The composition of claim 4 wherein the water is present in an amount of from about 25 to about 60 percent by weight, based on weight of dry hydraulic cement.
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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) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |