US4353748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cementitious product
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1980-06-13
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Granted: 1982-10-12
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Expires: 2000-06-13
Abstract
Abstract A cementitious product produced by setting of a composition comprising a mixture of at least one hydraulic cement and water not more than 2% of the total volume of the product comprising pores of maximum dimension exceeding 100 microns and preferably not more than 2% of the total volume comprising pores exceeding 15 microns in maximum dimension, the product preferably having a flexural strength of at least 40 MPa.
Inventors
- 👤 James D. Birchall
- 👤 Kevin Kendall
- 👤 Anthony J. Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:35
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/0051; C04B40/00; C04B40/0028; C04B40/005; C04B2111/00; C04B2111/00241; C04B2111/00301
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
39 words
A cementitious product produced by setting of a composition comprising a mixture of at least one hydraulic cement and water not more than 2% of the total volume of the product comprising pores of maximum dimension exceeding 100 microns.
Claim 2
Dependent Claim
39 words
A cementitious product produced by setting of a composition comprising a mixture of at least one hydraulic cement and water not more than 2% of the total volume of the product comprising pores of maximum dimension exceeding 100 microns.
Claim 3
Dependent Claim
30 words
A cementitious product as claimed in claim 1 in which not more than 2% of the total volume of the product comprises pores having a maximum dimension exceeding 50 microns.
Claim 4
Dependent Claim
30 words
A cementitious product as claimed in claim 1 in which not more than 2% of the total volume of the product comprises pores having a maximum dimension exceeding 15 microns.
Claim 5
Dependent Claim
53 words
A cementitious product produced by setting of a composition comprising a mixture of at least one hydraulic cement and water wherein not more than 2% of the total volume of the product comprises pores having a maximum dimension exceeding 15 microns, the cementitious product having a flexural strength of at least 40 MPa.
Claim 6
Dependent Claim
53 words
A cementitious product produced by setting of a composition comprising a mixture of at least one hydraulic cement and water wherein not more than 2% of the total volume of the product comprises pores having a maximum dimension exceeding 15 microns, the cementitious product having a flexural strength of at least 40 MPa.
Claim 7
Dependent Claim
31 words
A cementitious product as claimed in claim 1 or 4 in which not more than 0.5% of the total volume of the product comprises pores of maximum dimension exceeding 100 microns.
Claim 8
Dependent Claim
30 words
A cementitious product as claimed in claim 5 in which not more than 0.5% of the total volume of the product comprises pores having a maximum dimension exceeding 50 microns.
Claim 9
Dependent Claim
30 words
A cementitious product as claimed in claim 6 in which not more than 0.5% of the total volume of the product comprises pores having a maximum dimension exceeding 15 microns.
Claim 10
Dependent Claim
35 words
A cementitious product as claimed in claim 1 in which the total volume of pores in the product expressed as a proportion of the total volume of the product, including pores, does not exceed 20%.
Claim 11
Dependent Claim
35 words
A cementitious product as claimed in claim 8 in which the total volume of pores in the product expressed as a proportion of the total volume of the product, including pores, does not exceed 10%.
Claim 12
Dependent Claim
32 words
A cementitious product as claimed in claim 1 in which not more than 5% of the total volume of the product comprises pores having dimensions in the range 2 to 15 microns.
Claim 13
Dependent Claim
17 words
A cementitious product as claimed in claim 1 in which the hydraulic cement is a silicate cement.
Claim 14
Dependent Claim
17 words
A cementitious product as claimed in claim 1 in which the hydraulic cement is an aluminate cement.
Claim 15
Dependent Claim
19 words
A cementitious product as claimed in claim 1 in which the hydraulic cement is a calcium sulphate hemihydrate cement.
Claim 16
Dependent Claim
17 words
A cementitious product as claimed in claim 1 having a flexural strength of at least 40 MPa.
Claim 17
Dependent Claim
17 words
A cementitious product as claimed in claim 14 having a flexural strength of at least 50 MPa.
References Cited (Backward Citations)
US4017321A
Cited
US4070199A
Cited
US4157998A
Cited
US4188231A
Cited
US4209336A
Cited
US4168984A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-11 | 1986-04-12 | 1986-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-11 | 1990-04-12 | 1990-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-11 | 1994-04-12 | 1994-10-12 | $7700.00 | Window Closed / Lapsed |