US3641978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating apparatus
Assignee: Porvair PLC
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Filing: 1969-01-07
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Granted: 1972-02-15
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Expires: 1989-01-07
Abstract
Abstract Coating apparatus suitable for depositing superimposed layers of two different viscous liquids or pastes on a support is provided which comprises a pair of hoppers having one lip common to both hoppers, forming the downstream lip of the upstream hopper and the upstream lip of the downstream hopper.
Inventors
- 👤 George Stuart Hathorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:39
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/50; B05D7/52; B05D7/54; B05D7/542; B05D7/5423; B05D1/00; B05D1/26; B05D3/00; B05D3/10; B05D3/107; B05D3/108; D; D06; D06B; D06B15/00; D06B15/08; D06B15/085; D21; D21H; D21H23/00; D21H23/02; D21H23/22; D21H23/32; D21H23/40; D21H5/00; D21H5/0005; D21H5/0012; D21H5/0015
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
199 words
Coating apparatus comprising a support of strip form, a roller, a pair of hoppers, the support being arranged to pass around said roller and be supported by said rollers as it passes beneath said hoppers, tank means adapted to contain liquid, and guide means, whereby said support may be passed from said roller through said tank means beneath the surface of the liquid in said tank, when the apparatus is in use, with said support uppermost under the guidance of said guide means, said pair of hoppers respectively being adapted to contain coating material and each of said pair of hoppers having a narrow outlet slot beneath which said support is arranged to be passed to deposit a layer of the associated material, each said outlet slot being bounded by upstream and downstream lips wherein each said downstream lip forms a doctor blade to determine and smooth the upper surface of the associated material independently through each said outlet slot, one of said lips being common to both said hoppers thereby forming the downstream lip of said upstream hopper and the upstream lip of the downstream hopper, and said hopper outlets being arranged around the periphery of said roller.
Claim 2
Dependent Claim
199 words
Coating apparatus comprising a support of strip form, a roller, a pair of hoppers, the support being arranged to pass around said roller and be supported by said rollers as it passes beneath said hoppers, tank means adapted to contain liquid, and guide means, whereby said support may be passed from said roller through said tank means beneath the surface of the liquid in said tank, when the apparatus is in use, with said support uppermost under the guidance of said guide means, said pair of hoppers respectively being adapted to contain coating material and each of said pair of hoppers having a narrow outlet slot beneath which said support is arranged to be passed to deposit a layer of the associated material, each said outlet slot being bounded by upstream and downstream lips wherein each said downstream lip forms a doctor blade to determine and smooth the upper surface of the associated material independently through each said outlet slot, one of said lips being common to both said hoppers thereby forming the downstream lip of said upstream hopper and the upstream lip of the downstream hopper, and said hopper outlets being arranged around the periphery of said roller.
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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |