US3561757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hinged modular playground block system
Assignee: Individual
•
Filing: 1969-03-17
•
Granted: 1971-02-09
•
Expires: 1989-03-17
Abstract
Abstract A modular playground block system including a plurality of hollow block modules, each of which is hingedly connected to one other module, some of the hinges being vertically oriented and others horizontally disposed. Through passageways or ports connect from adjacent modules and at least two of the modules together forming an inclined plane for sliding and climbing.
Inventors
- 👤 William C Schillig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:48
CPC Classifications
A; A63; A63B; A63B9/00; A63B2208/00; A63B2208/12; A63B2210/00; A63B2210/50; Y; Y10; Y10S; Y10S52/00; Y10S52/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
74 words
A modular playground block system comprising at least three hollow block modules, at least two of said modules having means to permit ingress and egress of a child and being of sufficient interior size to receive a child completely within the confines thereof, means hingedly connecting each module to a single other module, at least one of said hinge means being horizontally disposed and at least one of said hinge means being vertically disposed.
Claim 2
Dependent Claim
74 words
A modular playground block system comprising at least three hollow block modules, at least two of said modules having means to permit ingress and egress of a child and being of sufficient interior size to receive a child completely within the confines thereof, means hingedly connecting each module to a single other module, at least one of said hinge means being horizontally disposed and at least one of said hinge means being vertically disposed.
Claim 3
Dependent Claim
32 words
A modular playground block system as defined in claim 1, wherein each of said hollow modules has two egress openings, wherein alignment of openings in adjacent block modules provides a connecting passageway.
Claim 4
Dependent Claim
21 words
A modular playground block system as defined in claim 1 wherein at least two of said block modules are rectangular solids.
Claim 5
Dependent Claim
35 words
A modular playground block system as defined in claim 1, wherein at least two of said block modules are right triangular prisms adapted to normally overlie each other with their longest planar faces in contact.
Claim 6
Dependent Claim
40 words
A modular playground block system as defined in claim 1, wherein one of said block modules has a concave face and another of said modules has a convex face, said faces being adapted to interfit in one position of use.
Claim 7
Dependent Claim
45 words
A modular playground block system as defined in claim 1, and further including color coded indicia on the faces of each block module, said indicia of adjacent faces on different modules forming a continuous design pattern when said modules are moved into a given arrangement.
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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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |