US3376147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire resistant wallboard
Assignee: National Gypsum Co
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Filing: 1964-08-20
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Granted: 1968-04-02
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Expires: 1984-08-20
Abstract
No abstract record available.
Inventors
- 👤 Robert M Dean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:37
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; C04B2111/00; C04B2111/00474; C04B2111/00612; C04B2111/0062; C04B2111/20; C04B2111/28; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/268
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A FIRE RESISTANT WALL BOARD CONSISTING ESSENTIALLY OF GYPSUM, UNEXPANDED VERMICULATE AND UNEXPANED PERLITE BOTH UNIFORMLY DISPERSED IN SAID GYPSUM, UNEXPANDED VERMICULITE BIEN GPRESENT IN AN AMOUNT AND OF A PARTICLE SIZE SUFFICIENT TO COMPENSATE BY EXPANSION ON EXPOSURE TO HEAT FOR THE SHRINKAGE OF SAID GYSPUM WHEN SAID GYPSUM IS DEHYDRATED BY EXPOSURE TO HEAT, SAID EXPANISON OF VERMICULITE AND SHRINKAGE OF GYPSUM PRODUCING FISSURES WITHIN THE WALLBOARD AND SAID PERLITE BING PRESENT IN AN AMOUNT AND OF PARTICLE SIZE SUFFICIENT TO SUBSTANTIALLY FILL SAID FISSURES BY SECONDARY EXPANSION OF PERLITE UPON EXPOSURE TO HEAT THROUGH SAID FISSURES, SAID SHRINKAGE OF SAID GYPSUM AND SAID COMPENSATION PROVIDED BY SAID VERMICULITE AND PERLITE ON EXPANSION BIENG WITHIN ABOUT 1/8" EXPANSION AND 3/16" CONTRACTION PR LINEAR FOOT.
Claim 2
Dependent Claim
126 words
A FIRE RESISTANT WALL BOARD CONSISTING ESSENTIALLY OF GYPSUM, UNEXPANDED VERMICULATE AND UNEXPANED PERLITE BOTH UNIFORMLY DISPERSED IN SAID GYPSUM, UNEXPANDED VERMICULITE BIEN GPRESENT IN AN AMOUNT AND OF A PARTICLE SIZE SUFFICIENT TO COMPENSATE BY EXPANSION ON EXPOSURE TO HEAT FOR THE SHRINKAGE OF SAID GYSPUM WHEN SAID GYPSUM IS DEHYDRATED BY EXPOSURE TO HEAT, SAID EXPANISON OF VERMICULITE AND SHRINKAGE OF GYPSUM PRODUCING FISSURES WITHIN THE WALLBOARD AND SAID PERLITE BING PRESENT IN AN AMOUNT AND OF PARTICLE SIZE SUFFICIENT TO SUBSTANTIALLY FILL SAID FISSURES BY SECONDARY EXPANSION OF PERLITE UPON EXPOSURE TO HEAT THROUGH SAID FISSURES, SAID SHRINKAGE OF SAID GYPSUM AND SAID COMPENSATION PROVIDED BY SAID VERMICULITE AND PERLITE ON EXPANSION BIENG WITHIN ABOUT 1/8" EXPANSION AND 3/16" CONTRACTION PR LINEAR FOOT.
References Cited (Backward Citations)
US2142164A
Cited
US2525066A
Cited
US2705197A
Cited
US2744022A
Cited
US2853394A
Cited
US2945820A
Cited
US3010911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-02 | 1971-10-02 | 1972-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-02 | 1975-10-02 | 1976-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-02 | 1979-10-02 | 1980-04-02 | $7700.00 | Window Closed / Lapsed |