US3305387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gypsum castings and method of producing the same
Assignee: Weyerhaeuser Co
•
Filing: 1963-05-16
•
Granted: 1967-02-21
•
Expires: 1983-05-16
Abstract
No abstract record available.
Inventors
- 👤 Richard S Fraser
- 👤 Paul Y Jone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:21
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B28/00; C04B28/14; C04B41/45; C04B41/46; C04B41/48; C04B41/4811; C04B41/60; C04B41/61; C04B41/62; C04B41/63
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A METHOD OF IMPROVING THE SURFACE AND SUBSURFACE STRENGTH OF A PERMEABLE GYPSUM CASTING WHILE RETAINING THE CASTING IN A PERMEABLE CONDITION, COMPRISING: FORMING AN UNCURED PERMEABLE CASTING CONTAINING FREE WATER; APPLYING A WATER-MISCIBLE SOLUTION OF A THERMOSETTING RESIN TO THE SURFACE OF THE UNCURED CASTING, SAID SOLUTION HAVING A VISCOSITY LESS THAN ABOUT 85 CENTISTOKES MEASURED AT 25*C.; ALLOWING THE SOLUTION TO PENETRATE BENEATH SAID SURFACEF AND REMOVING THE SOLVENT AND FREE WATER FROM THE CASTING WHILE CURING SAID RESIN TO AN INSOLUBLE STATE.
Claim 2
Independent Claim
85 words
A METHOD OF IMPROVING THE SURFACE AND SUBSURFACE STRENGTH OF A PERMEABLE GYPSUM CASTING WHILE RETAINING THE CASTING IN A PERMEABLE CONDITION, COMPRISING: FORMING AN UNCURED PERMEABLE CASTING CONTAINING FREE WATER; APPLYING A WATER-MISCIBLE SOLUTION OF A THERMOSETTING RESIN TO THE SURFACE OF THE UNCURED CASTING, SAID SOLUTION HAVING A VISCOSITY LESS THAN ABOUT 85 CENTISTOKES MEASURED AT 25*C.; ALLOWING THE SOLUTION TO PENETRATE BENEATH SAID SURFACEF AND REMOVING THE SOLVENT AND FREE WATER FROM THE CASTING WHILE CURING SAID RESIN TO AN INSOLUBLE STATE.
References Cited (Backward Citations)
US1160363A
Cited
DE611550C
Cited
GB425742A
Cited
GB549009A
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US2470918A
Cited
US3145502A
Cited
US2983630A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |