Patent US3873225A successfully refreshed from Google Patents.
US3873225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paving stones
Assignee: Individual
•
Filing: 1972-09-05
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Granted: 1975-03-25
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Expires: 1992-09-05
Abstract
Abstract A set of paving stones comprising two types of stones, one type having upwardly tapering side faces and the other type having downwardly tapering side faces, and one type being provided with protrusions at least at some of its side faces, while the other type is provided with corresponding grooves in its side faces.
Inventors
- 👤 Karna Jakobsen
- 👤 Otto Maurus Jakobsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:43
CPC Classifications
E; E01; E01C; E01C5/00; E01C2201/00; E01C2201/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
203 words
A paving stone arrangement comprising: a first and second type of stone, said stones of both types having top surfaces of substantially similar configuration, each stone of said first type having a plurality of side surfaces tapering exclusively inwardly and downwardly from the top surface thereof, at least one of said side surfaces of each stone of said first type being shaped with a substantially vertically extending groove, said substantially vertically extending groove having a depth which is largest adjacent the bottom surface of the stone and which is gradually reduced toward the top surface of the stone leaving the top surface of the stone unbroken, each stone of said second type having a plurality of side surfaces tapering exclusively outwardly and downwardly from said top surface thereof, at least one of said side surfaces of each stone of said second type being provided with a substantially vertically extending tongue-like projection received in one of said grooves of a neighboring stone of said first type, said tongue-like projections having a maximum protrusion at a base surface disposed adjacent the bottom surface of the stones of said second type and gradually diminishing toward the top surface of the stones leaving said top surface unbroken.
Claim 2
Dependent Claim
203 words
A paving stone arrangement comprising: a first and second type of stone, said stones of both types having top surfaces of substantially similar configuration, each stone of said first type having a plurality of side surfaces tapering exclusively inwardly and downwardly from the top surface thereof, at least one of said side surfaces of each stone of said first type being shaped with a substantially vertically extending groove, said substantially vertically extending groove having a depth which is largest adjacent the bottom surface of the stone and which is gradually reduced toward the top surface of the stone leaving the top surface of the stone unbroken, each stone of said second type having a plurality of side surfaces tapering exclusively outwardly and downwardly from said top surface thereof, at least one of said side surfaces of each stone of said second type being provided with a substantially vertically extending tongue-like projection received in one of said grooves of a neighboring stone of said first type, said tongue-like projections having a maximum protrusion at a base surface disposed adjacent the bottom surface of the stones of said second type and gradually diminishing toward the top surface of the stones leaving said top surface unbroken.
Claim 3
Dependent Claim
46 words
A paving stone arrangement according to claim 1, wherein at least two of said side surfaces of each stone of said first type and each stone of said second type are respectively provided with a substantially vertically extending groove and a substantially vertically extending tongue-like projection.
Claim 4
Dependent Claim
55 words
A paving stone arrangement according to claim 2, wherein each of the stones of said first and second type have a top surface of an elongated rectangular configuration each stone having on its opposed longer side surfaces a plurality of at least one of grooves and projections, respectively, with the remaining side surfaces being smooth.
Claim 5
Dependent Claim
62 words
A paving stone arrangement according to claim 2, wherein each of the stones of said first and second type have a top surface of a hexagonal configuration, and wherein said tongue-like projections on said second type of stone and said substantially vertically extending groove on said first type of stone are formed on two pairs of diametrically opposite sides of each stone.
Claim 6
Dependent Claim
50 words
A paving stone arrangement according to claim 2, wherein a curbstone is provided having a side length longer than that of the individual stones, said curbstone being provided with at least one of projections and grooves receivable with at least one of grooves and projections, respectively, of the individual stones.
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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 |