Patent US4015831A successfully refreshed from Google Patents.
US4015831A
Expired / Lapsed
US
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Arrangement for galvanization and chemical treatment of articles
Assignee: Bayer Pharma AG
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Filing: 1974-09-20
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Granted: 1977-04-05
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Expires: 1994-09-20
Abstract
Abstract An arrangement for the chemical treatment or galvanizing of articles or bulk materials in which the articles to be treated or processed are made of metal, plastics or other materials, and are held within a drum. The wall of the drum is provided with distributed openings or perforations having a conical shape in an alternating manner.
Inventors
- 👤 Wolfgang Petzold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:10
CPC Classifications
C; C25; C25D; C25D17/00; C25D17/16; C25D17/18; C25D17/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
103 words
A drum for plating and chemical treatment of articles comprising, a drum wall with distributed openings through said wall, said openings being alternating conically shaped and arranged over the entire drum wall, the cross-section of one opening on the exterior surface of the drum wall being smaller than the cross-section of said one opening on the interior surface of the drum wall, the cross-section of a neighboring opening on the exterior surface of the drum wall being larger than the cross-section of said neighboring opening on the interior surface of the drum wall, so that said drum wall has substantially maximum perforation density.
Claim 2
Dependent Claim
103 words
A drum for plating and chemical treatment of articles comprising, a drum wall with distributed openings through said wall, said openings being alternating conically shaped and arranged over the entire drum wall, the cross-section of one opening on the exterior surface of the drum wall being smaller than the cross-section of said one opening on the interior surface of the drum wall, the cross-section of a neighboring opening on the exterior surface of the drum wall being larger than the cross-section of said neighboring opening on the interior surface of the drum wall, so that said drum wall has substantially maximum perforation density.
Claim 3
Dependent Claim
25 words
The drum as defined in claim 1 wherein said openings extend the entire depth of the wall of said drum and have a conical shape.
Claim 4
Dependent Claim
17 words
The drum as defined in claim 1 wherein said openings are offset with respect to each other.
Claim 5
Dependent Claim
18 words
The drum as defined in claim 1 wherein said openings are in substantially close proximity of each other.
Claim 6
Dependent Claim
20 words
The drum as defined in claim 1 wherein said openings have the shape of a frustum of an eight-sided pyramid.
Claim 7
Dependent Claim
13 words
The drum as defined in claim 1 wherein said openings are substantially conical.
Claim 8
Dependent Claim
40 words
The drum as defined in claim 2 wherein said openings are offset with respect to each other, said openings being arranged in substantially close proximity of each other, said openings having the shape of a frustum of an eight-sided pyramid.
References Cited (Backward Citations)
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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) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |