Title: By-product gypsum fillers for mica-free joint compounds

Abstract: A filler for a mica-free joint compound, comprising by-product gypsum having a mean particle size between about 11 and about 12 microns, a percentage by weight of particles smaller than 1 micron of between about 5 and about 6.5, and a packed dry bulk volume no greater than about 93 cc. per 100 grams.

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Other info:

Inventors: Lane, Marvin K. (Chicago, IL, US)
Anderson, Winton C. (Elk Grove Village, IL, US)

Application Number: 663585
Filing Date: 1976-03-04
Publication_date: 1977-09-20
Assignee: United States Gypsum Company (Chicago, IL)
Primary Class(es): 428/402 106/784, 106/786, 423/161, 423/166, 423/555, 428/323, 428/703
Other Classes:
US Patent Ref:

2044942	Jun, 1936	Heckert	423/555.
2177269	Oct, 1939	Sullivan	423/555.
3262799	Jul, 1966	McCleary	423/555.
3328121	Jun, 1967	Shull	423/555.
3557029	Jan, 1971	Bergeron	260/8.
3840638	Oct, 1974	Morita	423/166.
3949047	Apr, 1976	Cherdron	423/166.

Other Refs:
Primary Examiner: Robinson, Ellis
Assistant Examiner:
Attorney: Kurlandsky; Samuel, Robinson; Robert H., Ohlson; Glenn W.