US4130973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Building block
Assignee: Individual
•
Filing: 1977-09-07
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Granted: 1978-12-26
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Expires: 1997-09-07
Abstract
Abstract In a building block of cement-stabilized elastic granulate there are provided blind holes which are filled with a heat-insulating material.
Inventors
- 👤 Stig O. S. Gustavsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:53
CPC Classifications
E; E04; E04C; E04C1/00; E04C1/40; E04C1/41; B; B28; B28B; B28B11/00; B28B11/04; B28B11/042; B28B11/043; E04B; E04B2/00; E04B2/02; E04B2002/0256; E04B2002/0289; E04B2002/0293; Y; Y10; Y10S; Y10S264/00; Y10S264/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
91 words
An improved heat-insulated building block comprising: a parallelepipedic body of cement-stabilized elastic granulate, said granulate being of a predetermined grade range for forming interstices, and wherein blind holes are formed extending into said body perpendicular from a surface thereof which is intended to be the lower side of the building block when in operative position, said holes being arranged in several rows each of which comprises a plurality of spaced holes; and heat-insulating foam plastic material injected into said holes for filling said holes and for penetration into said formed interstices.
Claim 2
Dependent Claim
91 words
An improved heat-insulated building block comprising: a parallelepipedic body of cement-stabilized elastic granulate, said granulate being of a predetermined grade range for forming interstices, and wherein blind holes are formed extending into said body perpendicular from a surface thereof which is intended to be the lower side of the building block when in operative position, said holes being arranged in several rows each of which comprises a plurality of spaced holes; and heat-insulating foam plastic material injected into said holes for filling said holes and for penetration into said formed interstices.
Claim 3
Dependent Claim
19 words
A building block as claimed in claim 1 wherein the foam plastic material comprises substantially rigid foamed urea-formaldehyde resin.
Claim 4
Dependent Claim
21 words
A building block as claimed in claim 1 wherein the heat-insulating foam plastic material is injected into said holes under pressure.
Claim 5
Dependent Claim
41 words
A building block as claimed in claim 1 wherein said granulate grade ranges from 3 to 8 mm to form an interstice volume of approximately 16%, and wherein the building block has a Lang thermal conductivity of approximately 0.09 W/m° C.
References Cited (Backward Citations)
GB1252562A
Cited
US3546833A
Cited
US4018018A
Cited
US3922413A
Cited
FR2307096A1
Cited
US4016693A
Cited
US4002002A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |