Patent US2307264A successfully refreshed from Google Patents.
Patent US2687394A successfully refreshed from Google Patents.
US2687394A
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Coated particles of calcium carbonate and method of making same
Assignee: Diamond Shamrock Corp
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Filing: 1949-08-20
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Granted: 1954-08-24
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Expires: 1969-08-20
Abstract
No abstract record available.
Inventors
- 👤 Harry J Somermeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:26
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/205; C08J3/21; C08J3/215; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
THE METHOD OF COAGULATING A POLYMER EMULSION OBTAINED BY EMULSION POLYMERIZATION OF A MONOMER COMPRISING VINYL CHLORIDE, WHICH INCLUDES THE STEPS OF MIXING SAID EMULSION WITH AN AQUEOUS SLURRY OF CALCIUM CARBONATE HAVING AN AVERAGE PARTICLES SIZE OF LESS THAN ONE MICRON THEREBY TO COAGULATE SAID EMULSION AND DEPOSIT POLYMER PARTICLES OF SAID EMULSION UPON SAID PARTICLES OF CALCIUM CARBONATE, AND RECOVERING THE COAGULATED MATERIAL THUS FORMED.
Claim 2
Independent Claim
67 words
THE METHOD OF COAGULATING A POLYMER EMULSION OBTAINED BY EMULSION POLYMERIZATION OF A MONOMER COMPRISING VINYL CHLORIDE, WHICH INCLUDES THE STEPS OF MIXING SAID EMULSION WITH AN AQUEOUS SLURRY OF CALCIUM CARBONATE HAVING AN AVERAGE PARTICLES SIZE OF LESS THAN ONE MICRON THEREBY TO COAGULATE SAID EMULSION AND DEPOSIT POLYMER PARTICLES OF SAID EMULSION UPON SAID PARTICLES OF CALCIUM CARBONATE, AND RECOVERING THE COAGULATED MATERIAL THUS FORMED.
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) | 1957-08-23 | 1958-02-22 | 1958-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-23 | 1962-02-22 | 1962-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-23 | 1966-02-22 | 1966-08-24 | $7700.00 | Window Closed / Lapsed |