US2954302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water repellent paper and sheathing board
Assignee: National Gypsum Co
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Filing: 1956-12-10
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Granted: 1960-09-27
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Expires: 1976-12-10
Abstract
No abstract record available.
Inventors
- 👤 Jr William S Gorman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:10
CPC Classifications
B; B28; B28B; B28B19/00; B28B19/0092; D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/14; D21H19/00; D21H19/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
81 words
THE PROCESS OF MAKING WATER-REPELLENT, GYPSUM, SHEATHING-BOARD, COMPRISING THE STEPS OF FORMING AN OILIN-WATER EMULSION OF FROM 40% TO 70% GRADE NO. 6 FUEL OIL AND WATER, APPLYING SAID EMULSION TO ONLY THE TOPSURFACE OF A HEAVY PAPER-WEB WITH LESS THAN COMPLETE THROUGH PENETRATION OF SAID PAPER BY SAID EMULSION, DRYING THE SAID COATED PAPER-WEB TO REMOVE THE EXCESS WATER THEREFROM, SUBSEQUENTLY DEPOSITING AN AQUEOUS, CALCINEDGYPSUM SLURRY ADJACENT THE BOTTOM-SURFACE OF SAID PAPER, AND FORMING A BOARD THEREFROM, WHEREBY SAID GYPSUM
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) | 1963-09-27 | 1964-03-28 | 1964-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-27 | 1968-03-28 | 1968-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-27 | 1972-03-28 | 1972-09-27 | $7700.00 | Window Closed / Lapsed |