Patent US2820714A successfully refreshed from Google Patents.
US2820714A
Expired / Lapsed
US
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Gypsum plaster set stabilization
Assignee: National Gypsum Co
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Filing: 1955-10-10
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Granted: 1958-01-21
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Expires: 1975-10-10
Abstract
No abstract record available.
Inventors
- 👤 Schneiter Henry James
- 👤 Otto A Oshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:43
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; C04B22/00; C04B22/08; C04B22/14; C04B22/142
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
67 words
A SET STABILIZED GYPSUM PLASTER COMPOSITION, COMPRISING 100 PARTS OF CALCINED GYPSUM, A MINOR PORTION OF RETARDER, AND FROM .1 TO 1 PART OF PRE-REACTED STABILIZER CONSISTING OF THE DRY PRODUCT OF THE REACTION OF A MIXTURE CONSISTING ESSENTIALLY OF 2 PARTS OF A SULFATE OF THE GROUP CONSISTING OF ALUMINUM, SODIUM ACID AND POTASSIUM ALUMINUM IN 1 TO 4 PARTS LIME IN THE PRESENCE OF WATER.
References Cited (Backward Citations)
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US1951691A
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US2078198A
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US2078200A
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US2216555A
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US2248033A
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US2465278A
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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) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |