US3813312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making gypsum board
Assignee: Individual
•
Filing: 1972-01-25
•
Granted: 1974-05-28
•
Expires: 1992-01-25
Abstract
Abstract A PROCESS OF PRODUCING GYPSUM OBARD OF ENHANCED STRENGTH AND RESISTANCE TO HUMIDIFIED BOND FAILURE AT ANY PARTICULAR DENSITY THROUGH THE USE OF A DELAYED ACTION ACCELERATOR. THE ACCELERATOR IS PREFERABLY FORMED BY GRINDING LANDPLASTER AND A SUGAR.
Inventors
- 👤 W Kinkade
- 👤 C Roe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:24
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |