Patent US4446190A successfully refreshed from Google Patents.
US4446190A
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US
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Ceramic tile with its rear configured as uniformly distributed projections
Assignee: COMPAHNIA IMMOBILIARE E FINANZIARIA SP A ITALIAN JOINT STOCK Co I-41042 FIORANO MODENESE ITALY VIA GHIAROLA NUOVA 128
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Filing: 1983-03-01
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Granted: 1984-05-01
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Expires: 2003-03-01
Abstract
Abstract A ceramic tile has its rear uniformly configured as small frusto-conical or frusto-pyramidal tapered projections 2 of constant height, thus eliminating internal stresses during firing, eliminating zones of different color tone on the front face, and improving the gripping coefficient when laying. A portion of the projections 2, in groups of at least two, are taller to form feet 3 for resting during stacking.
Inventors
- 👤 Ermanno Pernici
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:39
CPC Classifications
E; E04; E04F; E04F15/00; E04F15/02; E04F15/08; Y; Y10; Y10T; Y10T428/00; Y10T428/16; Y10T428/163; Y10T428/164; Y10T428/166; Y10T428/24; Y10T428/24479; Y10T428/24628; Y10T428/24669; Y10T428/24678; Y10T428/24942
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
71 words
A ceramic tile having a front surface and a rear surface, said rear surface being uniformly covered with tapered frusto-conical or square based frusto-pyramidal shaped projections (2) of constant height, interspersed with groups of at least two projections (3) of greater height which have the same size base as the projections (2) of constant height and are distributed over the entire rear surface of the tile (1) to constitute resting feet.
Claim 2
Dependent Claim
71 words
A ceramic tile having a front surface and a rear surface, said rear surface being uniformly covered with tapered frusto-conical or square based frusto-pyramidal shaped projections (2) of constant height, interspersed with groups of at least two projections (3) of greater height which have the same size base as the projections (2) of constant height and are distributed over the entire rear surface of the tile (1) to constitute resting feet.
Claim 3
Dependent Claim
31 words
A tile as claimed in claim 1, characterised in that the bases of the projections (2) of constant height have a surface area of between 25 and 100 mm 2 .
Claim 4
Dependent Claim
30 words
A tile as claimed in claim 1, characterised in that the projections (2) of constant height are distributed with a density of between 0.6 and 1.2 projections per square centimeter.
Claim 5
Dependent Claim
25 words
A tile as claimed in claim 1, characterised in that the projections (2) of constant height have a height of between 0.8 and 1.2 mm.
Claim 6
Dependent Claim
25 words
A tile as claimed in claim 1, characterised in that the projections (3) of greater height have a height of between 1.6 and 2.4 mm.
Claim 7
Dependent Claim
31 words
A tile as claimed in claim 1, characterised in that between two and four groups of projections (3) of greater height are provided for every 100 cm 2 of tile (1).
References Cited (Backward Citations)
US3018015A
Cited
US4146666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |