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US3481829A
Expired / Lapsed
US
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Method of sizing paper with silicone resin and of making gypsum wallboard therefrom
Assignee: National Gypsum Co
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Filing: 1967-07-27
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Granted: 1969-12-02
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Expires: 1987-07-27
Abstract
No abstract record available.
Inventors
- 👤 John D Shull Jr
- 👤 John W Klems
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:21
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/59
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2634252A
Cited
US3389042A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-01 | 1973-06-02 | 1973-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-01 | 1977-06-02 | 1977-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-01 | 1981-06-02 | 1981-12-02 | $7700.00 | Window Closed / Lapsed |