Patent US2806811A successfully refreshed from Google Patents.
US2806811A
Expired / Lapsed
US
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Paper-covered gypsum board
Assignee: United States Gypsum Co
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Filing: 1954-12-31
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Granted: 1957-09-17
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Expires: 1974-12-31
Abstract
No abstract record available.
Inventors
- 👤 Hazmburg Romulus S Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:07
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/04; E04C2/043; C; C04; C04B; C04B28/00; C04B28/14; D; D21; D21H; D21H27/00; D21H27/18; D21H27/22; D21H27/24; D21J; D21J1/00; D21J1/16; C04B2111/00; C04B2111/00474; C04B2111/00612; C04B2111/0062; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31964; Y10T428/31971; Y10T428/31975; Y10T428/31978; Y10T428/31982
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
91 words
PROCESS OF MAKING A PAPER-COVERED PLASTER BOARD WHICH IS RESISTANT TO INTRA-PLY SPLITTING WHICH COMPRISES FORMING A MULTI-PLY PAPER-COVER SHEET THEREFOR BY THE STEPS OF INCORPORATING WITH THE FIBERS OF THE PLUP FORMING THE LOWERMOST PLY OF SAID SHEET PRIOR TO THE FORMATION OF SAID PLY FROM ABOUT ONE-HALF TO THREE PERCENT BY WEIGHT OF A WET-STTRENGHT -IMPARTING AMINOPLASTIC RESIN, THEN IMPOSING THE OTHER PLIES THERETO TO FORM SAID SHEET, AND USING SAID SHEET WITH SAID RESIN-CONTAINING LAYER IN CONTACT WITH THE PLASTER CORE OF SAID BOARD TO FORM SAID BOARD.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |