US4167391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust trap
Assignee: Acme Marls Ltd
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Filing: 1977-10-12
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Granted: 1979-09-11
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Expires: 1997-10-12
Abstract
Abstract A shelf support for a ceramic-ware support structure in which a transverse groove extends across the upper shelf supporting surface to provide a dust trap. The support is intended for use with movable shelves of refractory material and prevents quantities of ceramic dust from falling onto the ware supported by the structure when the shelves are slid into position. Additionally, chamfers are provided on the shelf support and the associated uprights of the structure to reduce the amount of dust abraded from the shelves during insertion and removal.
Inventors
- 👤 William J. Lovatt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:24
CPC Classifications
F; F27; F27D; F27D5/00; F27D5/0006
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
55 words
A ceramic ware support structure comprising a plurality of upright pillars provided with outwardly extending shelf supports adapted to slidably receive and support at least one horizontally disposed shelf, each shelf support having a flat, generally horizontal supporting surface and defining an upwardly opening dust trap groove located outwardly of and below the supporting surface.
Claim 2
Dependent Claim
55 words
A ceramic ware support structure comprising a plurality of upright pillars provided with outwardly extending shelf supports adapted to slidably receive and support at least one horizontally disposed shelf, each shelf support having a flat, generally horizontal supporting surface and defining an upwardly opening dust trap groove located outwardly of and below the supporting surface.
Claim 3
Dependent Claim
39 words
A ceramic ware support structure according to claim 1 wherein each shelf support has at least one side edge extending from the associated pillar to a region remote therefrom, the edge being chamfered upwardly directly onto the supporting surface.
Claim 4
Dependent Claim
25 words
A ceramic ware support structure according to claim 2 wherein the pillars are chamfered at least at positions adjacent the chamfers on the shelf supports.
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) | 1982-09-10 | 1983-03-12 | 1983-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-10 | 1987-03-12 | 1987-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-10 | 1991-03-12 | 1991-09-11 | $7700.00 | Window Closed / Lapsed |