Patent US4015993A successfully refreshed from Google Patents.
US4015993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic composition with additive
Assignee: Zeon Corp
•
Filing: 1975-02-12
•
Granted: 1977-04-05
•
Expires: 1995-02-12
Abstract
Abstract A hydraulic composition comprising 100 parts by weight of a hydraulic substance and 0.01-2 parts by weight of a cyclopentane derivative selected from cyclopentanetetracarboxylic acid and alkali metal, alkaline earth metal and ammonium salts of cyclopentanetetracarboxylic acid.
Inventors
- 👤 Tadao Natsuume
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:47
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
54 words
A hydraulic composition comprising 100 parts by weight of a hydraulic substance selected from portland cement, alumina cement, blast furnace slag or a mixture of quicklime and siliceous sand and 0.01-2 parts by weight of a cyclopentane derivative selected from 1,2,3,4-cyclopentanetetracarboxylic acid and alkali metal, alkaline earth metal and ammonium salts of 1,2,3,4-cyclopentanetetracarboxylic acid.
Claim 2
Dependent Claim
54 words
A hydraulic composition comprising 100 parts by weight of a hydraulic substance selected from portland cement, alumina cement, blast furnace slag or a mixture of quicklime and siliceous sand and 0.01-2 parts by weight of a cyclopentane derivative selected from 1,2,3,4-cyclopentanetetracarboxylic acid and alkali metal, alkaline earth metal and ammonium salts of 1,2,3,4-cyclopentanetetracarboxylic acid.
Claim 3
Dependent Claim
12 words
The composition of claim 1 wherein the hydraulic substance is portland cement.
Claim 4
Dependent Claim
25 words
The composition of claim 1 wherein the cyclopentane derivative is a salt selected from alkali metal, alkaline earth metal and ammonium salts of 1,2,3,4-cyclopentanetetracarboxylic acid.
Claim 5
Dependent Claim
17 words
A composition of claim 1 wherein the cyclopentane derivative is an alkali metal salt of cyclopentanetetracarboxylic acid.
Claim 6
Dependent Claim
16 words
The composition of claim 1 wherein the cyclopentane derivative is a sodium salt of 1,2,3,4-cyclopentanetetracarboxylic acid.
Claim 7
Dependent Claim
16 words
The composition of claim 1 wherein the cyclopentane derivative is an ammonium salt of 1,2,3,4-cyclopentanetetracarboxylic acid.
Claim 8
Dependent Claim
16 words
The composition of claim 5 wherein the cyclopentane derivative is the tetrasodium salt of 1,2,3,4-cyclopentanetetracarboxylic acid.
Claim 9
Dependent Claim
16 words
The composition of claim 6, wherein the cyclopentane derivative as the tetraammonium salt of 1,2,3,4-cyclopentanetetracarboxylic acid.
Claim 10
Dependent Claim
25 words
The composition of the claim 1 which contains 0.01-1.0 part by weight of said cyclopentane derivative, per 100 parts by weight of the hydraulic substance.
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) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |