Patent US2865905A successfully refreshed from Google Patents.
US2865905A
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Plaster retarder and method of making same
Assignee: National Gypsum Co
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Filing: 1954-07-13
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Granted: 1958-12-23
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Expires: 1974-07-13
Abstract
No abstract record available.
Inventors
- 👤 Robert R Teale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:06
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; C04B24/00; C04B24/12; C04B24/14; Y; Y10; Y10S; Y10S530/00; Y10S530/859
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
THE METHOD OF MAKING HIGH STRENGTH RETARDER FOR GYPSUM PLASTER COMPRISING THE STEPS OF FORMING A SLURRY CONSISTING ESSENTIALLY OF 100 PARTS OF KERATIN, 20 TO 40 PARTS ALKALINE EARTH HYDROXIDE, AND 80 TO 250 PARTS WATER, MAINTAINING SAID SLURRY FREE OF ALKALI METAL COMPOUNDS, HYDROLYZING SAID SLURRY UNDER A PRESSURE GREATER THAN 30 LBS. PER SQ. IN. FOR A PERIOD OF 20 TO 90 MINUTES AT A TEMPERATURE OF FROM 220*F. TO 300*F.
Claim 2
Independent Claim
74 words
THE METHOD OF MAKING HIGH STRENGTH RETARDER FOR GYPSUM PLASTER COMPRISING THE STEPS OF FORMING A SLURRY CONSISTING ESSENTIALLY OF 100 PARTS OF KERATIN, 20 TO 40 PARTS ALKALINE EARTH HYDROXIDE, AND 80 TO 250 PARTS WATER, MAINTAINING SAID SLURRY FREE OF ALKALI METAL COMPOUNDS, HYDROLYZING SAID SLURRY UNDER A PRESSURE GREATER THAN 30 LBS. PER SQ. IN. FOR A PERIOD OF 20 TO 90 MINUTES AT A TEMPERATURE OF FROM 220*F. TO 300*F.
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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) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |