Patent US3591973A successfully refreshed from Google Patents.
US3591973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toy building kit
Assignee: Individual
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Filing: 1970-03-05
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Granted: 1971-07-13
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Expires: 1990-03-05
Abstract
Abstract A toy building kit has several structural elements. Some of these have at least one undercut groove in an exposed surface and others have at least one coupling head provided on an exposed surface and matingly engageable with the undercut groove. Such coupling heads each comprise a first portion which projects from the respective structural element and which is provided on its free end remote from the structural element with a second portion resembling a section severed from a sphere in a plane which is at least substantially parallel to the general plane of the exposed face.
Inventors
- 👤 Artur Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:06
CPC Classifications
A; A63; A63H; A63H33/00; A63H33/04; A63H33/06; A63H33/08; A63H33/082
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 words
In a toy building kit, in combination, a first structural element having a plurality of exposed surfaces; at least one undercut groove provided in at least one of said exposed surfaces; a second structural element having a plurality of exposed faces; and at least one coupling head provided on at least one of said exposed faces and matingly engageable with said undercut groove, said coupling head comprising a first portion projecting from said exposed face and having a free end remote from the latter, and a second portion provided on and projecting from said free end and resembling a section severed from a sphere in a plane which is at least substantially parallel to the general plane of said exposed face.
Claim 2
Dependent Claim
121 words
In a toy building kit, in combination, a first structural element having a plurality of exposed surfaces; at least one undercut groove provided in at least one of said exposed surfaces; a second structural element having a plurality of exposed faces; and at least one coupling head provided on at least one of said exposed faces and matingly engageable with said undercut groove, said coupling head comprising a first portion projecting from said exposed face and having a free end remote from the latter, and a second portion provided on and projecting from said free end and resembling a section severed from a sphere in a plane which is at least substantially parallel to the general plane of said exposed face.
Claim 3
Dependent Claim
32 words
In a kit as defined in claim 1, said groove having at least one open end, and said coupling head being insertable through said open end in direction lengthwise of said groove.
Claim 4
Dependent Claim
21 words
In a kit as defined in claim 1, said second portion having a planar surface directed away from said exposed face.
Claim 5
Dependent Claim
28 words
In a kit as defined in claim 1, said second portion having an endface directed away from said exposed face and being concave in direction towards the same.
Claim 6
Dependent Claim
16 words
In a kit as defined in claim 1, said first portion having a polygonal cross section.
Claim 7
Dependent Claim
18 words
In a kit as defined in claim 5, wherein the cross section of said first portion is quadratic.
Claim 8
Dependent Claim
16 words
In a kit as defined in claim 1, said first portion having a rounded cross section.
Claim 9
Dependent Claim
18 words
In a kit as defined in claim 7, wherein the cross section of said first portion is circular.
Claim 10
Dependent Claim
92 words
In a kit as defined in claim 1, said groove comprising an outer slot-shaped portion extending inwardly from said one exposed surface and being bounded by two transversely spaced outer surface portions, and an inner portion bounded by an inner circumferential surface portion making with said outer surface portions and being of divergent-convergent cross section in direction inwardly away from said outer portion; and said second portions being configurated so as to contact said inner suRface portion only in the region of the juncture of the same with said outer surface portions.
Claim 11
Dependent Claim
31 words
In a kit as defined in claim 9, wherein the spacing between said outer surface portions is greater than the maximum cross-sectional dimension of said first portion of said coupling head.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |