US4530889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acidified powdered interleaving
Assignee: PPG Industries Ohio Inc
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Filing: 1981-01-28
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Granted: 1985-07-23
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Expires: 2001-01-28
Abstract
Abstract A method and composition utilizing porous particulate interleaving material treated with a strong organic acid are disclosed to reduce staining of stacked glass sheets.
Inventors
- 👤 Paul F. Duffer
- 👤 Helmut Franz
- 👤 Joseph D. Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:20
CPC Classifications
B; B65; B65G; B65G49/00; B65G49/05; B65G49/06; B65G49/068; B65G49/069; B32; B32B; B32B2264/00; B32B2264/06; B32B2264/062; B32B2264/067; B32B2305/00; B32B2305/02; B32B2305/026; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/253; Y10T428/31504; Y10T428/31551; Y10T428/31634
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
40 words
A composition of matter useful as an interleaving material for separating glass sheets and providing stain resistance to the glass surfaces, which composition comprises a porous powdered support material impregnated with a strong organic acid which is an organotin halide.
Claim 2
Dependent Claim
40 words
A composition of matter useful as an interleaving material for separating glass sheets and providing stain resistance to the glass surfaces, which composition comprises a porous powdered support material impregnated with a strong organic acid which is an organotin halide.
Claim 3
Dependent Claim
29 words
The composition according to claim 1, wherein the organotin halide is a alkyltin halide selected from the group consisting of methyltin trichloride, dimethyltin dichloride, trimethyltin chloride and mixtures thereof.
Claim 4
Dependent Claim
20 words
The composition according to claim 2, wherein the alkyltin halide comprises 80 percent dimethyltin dichloride and 20 percent methyltin trichloride.
Claim 5
Independent Claim
51 words
A method for reducing the incidence of staining on the surface of stacked glass sheets comprising the steps of: a. impregnating a porous powdered interleaving material with a strong organic acid which is an organotin halide; and b. dispersing said acid treated interleaving material between said glass sheets prior to stacking.
Claim 6
Independent Claim
51 words
A method for reducing the incidence of staining on the surface of stacked glass sheets comprising the steps of: a. impregnating a porous powdered interleaving material with a strong organic acid which is an organotin halide; and b. dispersing said acid treated interleaving material between said glass sheets prior to stacking.
Claim 7
Dependent Claim
33 words
The method according to claim 4, wherein the step of impregnating the interleaving material with the organotin halide is accomplished by contacting the interleaving material with an aqueous solution of the organotin halide.
Claim 8
Dependent Claim
37 words
The method according to claim 5, wherein the organic interleaving material is contacted with a volume of solution containing a quantity of organotin halide sufficient to provide stain reducing properties and the solution is dried in situ.
Claim 9
Dependent Claim
43 words
The method according to claim 5, wherein the interleaving material is a. contacted with the aqueous solution for a sufficient time to absorb a quantity of organotin halide sufficient to provide stain reducing properties; b. separated from the aqueous solution; and c dried.
Claim 10
Dependent Claim
14 words
The method according to claim 4, wherein the organotin halide is an alkyltin halide.
Claim 11
Dependent Claim
26 words
The method according to claim 8, wherein the alkyltin halide is selected from the group consisting of methyltin trichloride, dimethyltin dichloride, trimethyltin chloride and mixtures thereof.
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) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |