US3872204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for continuously manufacturing shaped gypsum articles
Assignee: Taiheiyo Cement Corp
•
Filing: 1972-08-02
•
Granted: 1975-03-18
•
Expires: 1992-08-02
Abstract
Abstract A method for continuously manufacturing shaped gypsum articles which comprises mixing insoluble anhydrite with an accelerator for the setting, bentonite, methyl or ethyl alcohol and a proper amount of water, kneading the mixture to obtain a doughy paste, and extruding said paste continuously to manufacture shaped articles, followed by the setting thereof.
Inventors
- 👤 Tsuyoshi Yano
- 👤 Hiroshi Onishi
- 👤 Inahide Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:41
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; C04B28/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
104 words
A METHOD FOR CONTINUOUSLY MANUFACTURING SHAPED GYPSUM ARTICLES COMPRISING MIXING 100 WEIGHT PARTS OF INSOLUBLE ANHYDRITE WITH FROM 0.5 TO 2.5 WEIGHT PARTS OF AN ALUM AS AN ACCELETOR FOR THE SETTING, FROM 3 TO 10 WEIGHT PARTS OF BENTONITE, FROM 1 TO 4 WEIGHT PARTS OF ALCOHOL SELECTED FROM THE GROUP CONSISTING OF METHYL ALCOHOL AND ETHYL ALCOHOL, AND FROM 20 TO 30 WEIGHT PARTS OF WATER; KNEADING THE MIXTURE TO OBTAIN A DOGHY PASTE; EXTRUDING THE DOUGHY PASTE TO OBTAIN A CONTINUOUS BAND OF SHAPED DOUGH THROUGH A DIE WHEREIN THE EXTRUDING PRESSURE IS SUBSTANTIALLY 10 TO 12 KG/CM2 CUTTING SAID BAND
Claim 2
Independent Claim
104 words
A METHOD FOR CONTINUOUSLY MANUFACTURING SHAPED GYPSUM ARTICLES COMPRISING MIXING 100 WEIGHT PARTS OF INSOLUBLE ANHYDRITE WITH FROM 0.5 TO 2.5 WEIGHT PARTS OF AN ALUM AS AN ACCELETOR FOR THE SETTING, FROM 3 TO 10 WEIGHT PARTS OF BENTONITE, FROM 1 TO 4 WEIGHT PARTS OF ALCOHOL SELECTED FROM THE GROUP CONSISTING OF METHYL ALCOHOL AND ETHYL ALCOHOL, AND FROM 20 TO 30 WEIGHT PARTS OF WATER; KNEADING THE MIXTURE TO OBTAIN A DOGHY PASTE; EXTRUDING THE DOUGHY PASTE TO OBTAIN A CONTINUOUS BAND OF SHAPED DOUGH THROUGH A DIE WHEREIN THE EXTRUDING PRESSURE IS SUBSTANTIALLY 10 TO 12 KG/CM2 CUTTING SAID BAND
Claim 3
Dependent Claim
35 words
A method according to claim 1 wherein, immediately prior to extruding, the doughy paste is passed through a degassing vacuum chamber arranged in the extruder, the vacuum degree of said degassing chamber approximating minus 720mmHg.
Claim 4
Dependent Claim
20 words
A method according to claim 1, wherein bentonite is mixed at the ratio of from 4 to 7 weight parts.
Claim 5
Dependent Claim
23 words
A method according to claim 1, wherein from 1 to 5 weight parts of fibrous material are added to the mixture before kneading.
References Cited (Backward Citations)
US1600552A
Cited
US1995412A
Cited
US2527390A
Cited
US2531496A
Cited
US3219467A
Cited
US3311516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |