US2965528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gypsum board
Assignee: Celotex Corp
•
Filing: 1955-11-09
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Granted: 1960-12-20
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Expires: 1975-11-09
Abstract
No abstract record available.
Inventors
- 👤 Clarence J Loechl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:51
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/04; E04C2/043; C; C04; C04B; C04B24/00; C04B24/24; C04B24/38; C04B2111/00; C04B2111/00474; C04B2111/00612; C04B2111/0062; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/249932; Y10T428/249953; Y10T428/249967; Y10T428/249968
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
59 words
THE METHOD OF FORMING A LIGHT WEIGHT GYPSUM CAST OF DENSITY OF BETWEEN ABOUT 30 TO 45 POUNDS PER CUBIC FOOT COMPRISING THE STEPS, ADMIXING WITH THE WATER INGREDIENTS IN THE APPROXIMATE PROPORTIONS OF ABOUT 1000 POUNDS OF CALCINED CYPSUM, ABOUT 8 POUNDS OF STARCH, ABOUT 11 CUBIC FEET OF STABLE FOAM, AND ABOUT 0.25 TO 1% GUAR GUM.
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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) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |