Patent US3618921A successfully refreshed from Google Patents.
US3618921A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffuser plate
Assignee: Individual
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Filing: 1970-06-15
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Granted: 1971-11-09
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Expires: 1990-06-15
Abstract
Abstract There is disclosed herein a diffuser plate for separating coils of sheet metal stacked on a vertical axis in an annealing furnace, the plate comprising two superimposed layers of flat bars, the bars in one layer being straight with tapered edges and uniformly skewed with respect to true radii of the plate and the bars in the other layer being tapered and curved in a circumferential direction opposite to the slant of the bars in the first layer and overlapping said bars in said first layer.
Inventors
- 👤 Robert Lee Corbett Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:37
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/663; C21D9/673
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
185 words
A diffuser plate for spacing coils of strip metal stacked coaxially within an annealing furnace, said diffuser plate comprising two contiguous layers of flat metal bars disposed about a vertical axis and circumferentially spaced from each other in each layer; the inner ends of said bars defining a substantially circular central opening about said axis whereby said bars form a flat, annular structure; the bars in one of said layers being substantially straight and skewed with respect to true radii of the plate in one circumferential direction and the bars in the other of said layers being curved in the opposite circumferential direction; each said bar in each said layer having an outer end portion overlapping the outer end portion of a first bar in said other layer, a medial portion overlapping a medial portion of a second bar in said other layer, and an inner end portion overlapping the inner end portion of a third bar of said other layer; adjacent bars in each said layer defining passages therebetween, each of said passages crossing over and open to passages of the other said layer.
Claim 2
Dependent Claim
185 words
A diffuser plate for spacing coils of strip metal stacked coaxially within an annealing furnace, said diffuser plate comprising two contiguous layers of flat metal bars disposed about a vertical axis and circumferentially spaced from each other in each layer; the inner ends of said bars defining a substantially circular central opening about said axis whereby said bars form a flat, annular structure; the bars in one of said layers being substantially straight and skewed with respect to true radii of the plate in one circumferential direction and the bars in the other of said layers being curved in the opposite circumferential direction; each said bar in each said layer having an outer end portion overlapping the outer end portion of a first bar in said other layer, a medial portion overlapping a medial portion of a second bar in said other layer, and an inner end portion overlapping the inner end portion of a third bar of said other layer; adjacent bars in each said layer defining passages therebetween, each of said passages crossing over and open to passages of the other said layer.
Claim 3
Dependent Claim
30 words
A diffuser plate as set forth in claim 1: said bars and passages in both said layers tapering inwardly from the outer edge of said plate to said central opening.
Claim 4
Dependent Claim
38 words
A diffuser plate as set forth in claim 1: said substantially straight bars having substantially straight, inwardly converging side edges and said curved bars being semicrescent in shape and each having a convex and a concave side edge.
Claim 5
Dependent Claim
73 words
A diffuser plate as set forth in claim 1: each said bar in each said layer having the outer end portion thereof welded to the outer end portion of said first bar in said other layer, the medial portion thereof welded to a medial portion of said second bar in said other layer, and the inner end portion thereof welded to the inner end portion of said third bar of said other layer.
Claim 6
Dependent Claim
81 words
A diffuser plate as set forth in claim 1: the bars in one of said layers being radially outwardly offset with respect to the bars in the other said layer, each bar in said one layer being welded across its inner end edge to the outer end portion of a bar in said other layer and each bar in said other layer being welded across its outer end edge to the outer end portion of a bar in said one layer.
Claim 7
Dependent Claim
54 words
A diffuser plate as set forth in claim 1: each said bar in each said layer having a substantial portion of one of its side edges overlapping a bar of The other said layer and welded thereto only at spaced areas to allow separate expansion and contraction of the bars due to temperature changes.
Claim 8
Dependent Claim
54 words
A diffuser plate as set forth in claim 1: each said bar in each said layer having more than one-half of one of its side edges overlapping a bar of the other said layer and welded thereto only at spaced areas to allow separate expansion and contraction of the bars due to temperature changes.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |