US4347735A
Expired / Lapsed
US
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Process for monitoring solvent content of green ceramic sheet, and apparatus therefor
Assignee: International Business Machines Corp
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Filing: 1980-12-15
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Granted: 1982-09-07
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Expires: 2000-12-15
Abstract
Abstract A process for monitoring solvent content in a ceramic green sheet wherein the green sheet is partially supported so that a portion of the sheet is free to sag under the influence of gravity, with or without any additional force to enhance or minimize the sag, measuring the rate of sag of the portion of the sheet free to sag, and comparing the rate of sag to a correlation standard of rate of sag versus solvent content of the green sheet under test to determine acceptability.
Inventors
- 👤 Kamalesh S. Desai
- 👤 George E. Melvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:23
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/0011; G; G01; G01N; G01N33/00; G01N33/38; G01N33/388; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H05K2203/00; H05K2203/07; H05K2203/0779; H05K2203/0783; H05K2203/16; H05K2203/163
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
86 words
A process for determining the solvent content of a ceramic green sheet containing particulate ceramic material, an organic binder resin, and a solvent that interacts with the resin comprising, partially supporting a ceramic green sheet in a manner that a portion of the sheet is unsupported and free to sag, measuring the rate of sag of said portion of ceramic green sheet, comparing the rate of sag to a correlation of rate of sag versus solvent content for similar ceramic green sheets to determine solvent concentration.
Claim 2
Dependent Claim
86 words
A process for determining the solvent content of a ceramic green sheet containing particulate ceramic material, an organic binder resin, and a solvent that interacts with the resin comprising, partially supporting a ceramic green sheet in a manner that a portion of the sheet is unsupported and free to sag, measuring the rate of sag of said portion of ceramic green sheet, comparing the rate of sag to a correlation of rate of sag versus solvent content for similar ceramic green sheets to determine solvent concentration.
Claim 3
Dependent Claim
29 words
The method of claim 1 wherein said ceramic green sheets have a screened-on pattern of conductive metal paste, which paste includes a solvent that interacts with said binder resin.
Claim 4
Dependent Claim
32 words
The method of claim 1 wherein said ceramic green sheet is supported on two spaced supports, with the spacing sufficient to permit sagging of the central portion of said ceramic green sheet.
Claim 5
Dependent Claim
15 words
The method of claim 3 wherein said spaced supports are rods with smooth polished surfaces.
Claim 6
Dependent Claim
18 words
The method of claim 1 wherein said unsupported ceramic green sheet sags under the sole influence of gravity.
Claim 7
Independent Claim
122 words
An apparatus for determining the solvent content of a ceramic green sheet containing particulate ceramic material, an organic binder resin, and a solvent that interacts with the resin comprising, a means to support a ceramic green sheet in a manner that at least a portion of the sheet is free to sag under the influence of gravity, a means to determine the distance of sag of the unsupported portion of said ceramic green sheet over a timed interval and a correlation for the ceramic green sheet to be tested of rate of sag versus solvent content, the solvent content determined from a comparison of the measured distance of sag over a predetermined time interval to the rate of sag of said correlation.
Claim 8
Independent Claim
122 words
An apparatus for determining the solvent content of a ceramic green sheet containing particulate ceramic material, an organic binder resin, and a solvent that interacts with the resin comprising, a means to support a ceramic green sheet in a manner that at least a portion of the sheet is free to sag under the influence of gravity, a means to determine the distance of sag of the unsupported portion of said ceramic green sheet over a timed interval and a correlation for the ceramic green sheet to be tested of rate of sag versus solvent content, the solvent content determined from a comparison of the measured distance of sag over a predetermined time interval to the rate of sag of said correlation.
Claim 9
Dependent Claim
27 words
The apparatus of claim 6 wherein said means to support a green sheet is comprised of two elongated spaced support elements have a smooth substantially frictionless surface.
Claim 10
Dependent Claim
32 words
The apparatus of claim 7 wherein said means to determine the distance of sag of the ceramic green sheet is a microscope provided with a means to indicate the plane of focus.
Claim 11
Dependent Claim
30 words
The apparatus of claim 6 which further includes a flat support, a means to extend and retract said elongated spaced support elements from positions above and below said flat surface.
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) | 1985-09-06 | 1986-03-08 | 1986-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-06 | 1990-03-08 | 1990-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-06 | 1994-03-08 | 1994-09-07 | $7700.00 | Window Closed / Lapsed |