Patent US3778329A successfully refreshed from Google Patents.
US4284433A
Expired / Lapsed
US
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Additives for water-hardening binding agents
Assignee: Evonik Operations GmbH
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Filing: 1979-04-13
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Granted: 1981-08-18
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Expires: 1999-04-13
Abstract
Abstract Water-hardening binding agent such as concrete, mortar, cement and the like are modified with a solid additive in the form of aggregates consisting of fine particle having a grain size of from 0.1 to 10 mm, preferably in pelletized or pressed grain form. These additives have an adjustable rate of dissolution and permit controlling the speed and manner of hardening of said water-hardening binding agent.
Inventors
- 👤 Alois Aignesberger
- 👤 Jean-Pierre Deppen
- 👤 Hans-Gunter Rosenbauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:55
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/16; C04B24/20; C04B24/22; C04B40/00; C04B40/06; C04B40/0633; C04B20/00; C04B20/10; C04B22/00; C04B24/24; C04B24/26
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
83 words
Solid additive for modifying water-hardening binding agents, which additive comprises aggregates consisting of mechanically compressed fine particles with a grain size of from 0.1 to 10 mm and being composed of an agent consisting of a naphthalenesulphonic acid derivative-formaldehyde condensate, a resin based on an amino-s-triazine with at least two NH 2 groups and modified with sulphite or sulphonic acid, a sulphite- or sulfonic acid-modified melamine-formaldehyde polycondensate, a copolymer based on styrene and acrylonitrile, a lignin sulfonate, or a phenol-sulphonic acid-formaldehyde polycondensation product.
Claim 2
Dependent Claim
83 words
Solid additive for modifying water-hardening binding agents, which additive comprises aggregates consisting of mechanically compressed fine particles with a grain size of from 0.1 to 10 mm and being composed of an agent consisting of a naphthalenesulphonic acid derivative-formaldehyde condensate, a resin based on an amino-s-triazine with at least two NH 2 groups and modified with sulphite or sulphonic acid, a sulphite- or sulfonic acid-modified melamine-formaldehyde polycondensate, a copolymer based on styrene and acrylonitrile, a lignin sulfonate, or a phenol-sulphonic acid-formaldehyde polycondensation product.
Claim 3
Dependent Claim
19 words
Solid additive as claimed in claim 1 wherein the aggregates have a size of from 0.5 to 5 mm.
Claim 4
Dependent Claim
19 words
Solid additive as claimed in claim 1 wherein the aggregates have a size of from 0.5 to 3 mm.
Claim 5
Dependent Claim
15 words
Solid additive as claimed in claim 1 wherein said aggregates are provided with a coating.
Claim 6
Dependent Claim
22 words
Solid additive as claimed in claim 4 wherein said coating is an organic coating which is sparingly soluble or insoluble in water.
Claim 7
Dependent Claim
14 words
Solid additive as claimed in claim 4 wherein said coating is an inorganic coating.
Claim 8
Dependent Claim
18 words
Solid additive as claimed in claim 5 wherein said organic coating is polyvinyl acetate, polyvinyl propionate or polyacrylate.
Claim 9
Dependent Claim
16 words
Solid additive as claimed in claim 6 wherein said inorganic coating is hydrated cement or gypsum.
Claim 10
Dependent Claim
26 words
Method for regulating the working time of water-hardening binding agents, which method comprises incorporating into said binding agent a solid additive as claimed in claim 1.
Claim 11
Dependent Claim
13 words
Method as claimed in claim 9 wherein said aggregate is compressed or pelletized.
Claim 12
Dependent Claim
19 words
Method as claimed in claim 9 wherein the aggregate particles have a size of from 0.5 to 10 mm.
Claim 13
Dependent Claim
16 words
Method as claimed in claim 9 wherein said water-hardening binding agent is mortar, concrete or cement.
Claim 14
Dependent Claim
26 words
Water-hardening binding agent composition comprising at least one of cement, concrete, mortar or flooring plaster and incorporated therein a solid additive as claimed in claim 1.
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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) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |