US3873402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic tiles
Assignee: Buchtal GmbH
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Filing: 1973-02-22
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Granted: 1975-03-25
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Expires: 1993-02-22
Abstract
Abstract The specification describes improved ceramic ''''split'''' tiles, that is to say tiles which are joined together back to back during firing and split apart for use. In accordance with the invention, the tiles of each pair are connected together by connecting zones or necks alternating with raised or convex and sunken or concave surface portions. The raised and sunken surface portions are present on both tiles and each raised surface portion fits in a complementary manner into a sunken portion in the other tile and stands proud of the connecting zones.
Inventors
- 👤 Karl Mrasek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:33
CPC Classifications
E; E04; E04F; E04F13/00; E04F13/07; E04F13/08; E04F13/14; E04F13/142; Y; Y10; Y10T; Y10T428/00; Y10T428/15; Y10T428/16; Y10T428/163; Y10T428/164; Y10T428/166; Y10T428/24; Y10T428/24479; Y10T428/24521; Y10T428/24537; Y10T428/24744
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
161 words
IN TILES OF DENSELY FIRED CERAMIC MATERIAL FORMED IN PAIRS ARRANGED BACK TO BACK WITH THEIR BACK FACES SEPARATED BY A RELATIVELY THIN CHANNEL EXTENDING LENGTHWISE OF THE TILES, SAID CHANNEL AT SPACED POINTS BEING INTERRUPTED BY THIN NECKS OF MATERIAL INTERCONNECTING THE INDIVIDUAL TILES, THE IMPROVEMENT IN SAID TILES COMPRISING: LATERALLY OF SAID TILES SAID CHANNEL BEING UNDULATED AND FORMING ALTERNATING RIBS AND VALLEYS EXTENDING LENGTHWISE OF SAID TILES, SAID NECKS BEING LOCATED INTERMEDIATE THE TOPS OF SAID RIBS AND THE BOTTOMS OF SAID VALLEYS WHEREBY WHEN SAID NECKS ARE FRACTURED TO SEPARATE SAID TILES NO PORTION OF THE FRACTURED NECKS PROJECTS ABOVE THE TOPS OF SAID RIBS ON EITHER TILE; A LONGITUDINAL SLOT IN EACH OF THE INDIVIDUAL TILES POSITIONED INTERMEDIATE SAID NECKS AND COMMUNICATING WITH SAID CHANNEL FOR RECEIVING A SPLITTING TOOL FOR SEPARATING THE INDIVIDUAL TILES AND SAID SLOT IN EACH INDIVIDUAL TILE PROVIDING A DEEP GROOVE FOR RECEIVING THE BONDING MATERIAL USED TO INSTALL THE TILE.
Claim 2
Dependent Claim
161 words
IN TILES OF DENSELY FIRED CERAMIC MATERIAL FORMED IN PAIRS ARRANGED BACK TO BACK WITH THEIR BACK FACES SEPARATED BY A RELATIVELY THIN CHANNEL EXTENDING LENGTHWISE OF THE TILES, SAID CHANNEL AT SPACED POINTS BEING INTERRUPTED BY THIN NECKS OF MATERIAL INTERCONNECTING THE INDIVIDUAL TILES, THE IMPROVEMENT IN SAID TILES COMPRISING: LATERALLY OF SAID TILES SAID CHANNEL BEING UNDULATED AND FORMING ALTERNATING RIBS AND VALLEYS EXTENDING LENGTHWISE OF SAID TILES, SAID NECKS BEING LOCATED INTERMEDIATE THE TOPS OF SAID RIBS AND THE BOTTOMS OF SAID VALLEYS WHEREBY WHEN SAID NECKS ARE FRACTURED TO SEPARATE SAID TILES NO PORTION OF THE FRACTURED NECKS PROJECTS ABOVE THE TOPS OF SAID RIBS ON EITHER TILE; A LONGITUDINAL SLOT IN EACH OF THE INDIVIDUAL TILES POSITIONED INTERMEDIATE SAID NECKS AND COMMUNICATING WITH SAID CHANNEL FOR RECEIVING A SPLITTING TOOL FOR SEPARATING THE INDIVIDUAL TILES AND SAID SLOT IN EACH INDIVIDUAL TILE PROVIDING A DEEP GROOVE FOR RECEIVING THE BONDING MATERIAL USED TO INSTALL THE TILE.
Claim 3
Dependent Claim
24 words
Tiles as described in claim 1 wherein the walls of said slots converge toward said channel to form a groove of undercut cross section.
Claim 4
Dependent Claim
23 words
Tiles as described in claim 1 wherein said necks when fractured form steps generally parallel to the front face of the individual tiles.
Claim 5
Dependent Claim
144 words
In tiles of densely fired ceramic material formed in pairs arranged back to back with their back faces separated by a relatively thin channel extending lengthwise of the tiles, said channel at spaced points being interrupted by thin necks of material interconnecting the individual tiles, the improvement in said tiles comprising: laterally of said tiles each of said channels in cross section having a straight central portion and oppositely projecting end portions extending at an acute angle to said central portion, said ends of adjacent ones of said channels being spaced to form said necks, the cross-sectional plane of said central portion being inclined to the planes of the faces of said tiles whereby the ends of said channels and thereby said necks are arranged in a plane generally intermediate the thickest and thinnest portions of each of said tiles formed by said channels.
Claim 6
Dependent Claim
144 words
In tiles of densely fired ceramic material formed in pairs arranged back to back with their back faces separated by a relatively thin channel extending lengthwise of the tiles, said channel at spaced points being interrupted by thin necks of material interconnecting the individual tiles, the improvement in said tiles comprising: laterally of said tiles each of said channels in cross section having a straight central portion and oppositely projecting end portions extending at an acute angle to said central portion, said ends of adjacent ones of said channels being spaced to form said necks, the cross-sectional plane of said central portion being inclined to the planes of the faces of said tiles whereby the ends of said channels and thereby said necks are arranged in a plane generally intermediate the thickest and thinnest portions of each of said tiles formed by said channels.
Claim 7
Dependent Claim
31 words
Tiles as described in claim 4 wherein a tool receiving opening communicates with at least one of said channels at an end of said tiles to facilitate separation of said tiles.
Claim 8
Dependent Claim
142 words
In tiles of densely fired ceramic material formed in Pairs arranged back to back with their back faces separated by a relatively thin channel extending lengthwise of the tiles, said channel at spaced points being interrupted by thin necks of material interconnecting the individual tiles, the improvement in said tiles comprising: laterally of said tiles said channel being undulated and forming alternating ribs and valleys extending lengthwise of said tiles, said necks being located intermediate the tops of said ribs and the bottoms of said valleys whereby said necks are fractured to separate said tiles no portion of the fractured necks projects above the tops of said ribs on either tile; a tool opening in each of the individual tiles positioned intermediate a pair of said necks and communicating with said channel for receiving a splitting tool for separating the individual tiles.
Claim 9
Dependent Claim
142 words
In tiles of densely fired ceramic material formed in Pairs arranged back to back with their back faces separated by a relatively thin channel extending lengthwise of the tiles, said channel at spaced points being interrupted by thin necks of material interconnecting the individual tiles, the improvement in said tiles comprising: laterally of said tiles said channel being undulated and forming alternating ribs and valleys extending lengthwise of said tiles, said necks being located intermediate the tops of said ribs and the bottoms of said valleys whereby said necks are fractured to separate said tiles no portion of the fractured necks projects above the tops of said ribs on either tile; a tool opening in each of the individual tiles positioned intermediate a pair of said necks and communicating with said channel for receiving a splitting tool for separating the individual tiles.
Claim 10
Dependent Claim
20 words
Tiles as described in claim 6 wherein one of said tool openings is provided between each pair of said necks.
Claim 11
Dependent Claim
20 words
Tiles as described in claim 6 wherein one of said tool openings is provided at each end of said channel.
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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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |