US3321171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat insulation boards
Assignee: National Gypsum Co
•
Filing: 1965-04-26
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Granted: 1967-05-23
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Expires: 1985-04-26
Abstract
No abstract record available.
Inventors
- 👤 Edward R Gorka
- 👤 Norbert W Kaleta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:35
CPC Classifications
B; B22; B22D; B22D7/00; B22D7/06; B22D7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A HEAT-INSULATING COMPOSITION COMPRISING FROM ABOUT 30% TO ABOUT 45% BY WEIGHT OF MINERAL WOOL, FROM ABOUT 40% TO ABOUT 55% BY WEIGHT OF FINELY DIVIDED SILICA, FROM ABOUT 1% TO ABOUT 4% BY WEIGHT OF CELLULOSE FIBERS, FROM ABOUT 3% TO ABOUT 6% BY WEIGHT OF STARCH, AND FROM ABOUT 3% TO ABOUT 6% BY WEIGHT OF FINELY DIVIDED CLAY.
Claim 2
Dependent Claim
61 words
A HEAT-INSULATING COMPOSITION COMPRISING FROM ABOUT 30% TO ABOUT 45% BY WEIGHT OF MINERAL WOOL, FROM ABOUT 40% TO ABOUT 55% BY WEIGHT OF FINELY DIVIDED SILICA, FROM ABOUT 1% TO ABOUT 4% BY WEIGHT OF CELLULOSE FIBERS, FROM ABOUT 3% TO ABOUT 6% BY WEIGHT OF STARCH, AND FROM ABOUT 3% TO ABOUT 6% BY WEIGHT OF FINELY DIVIDED CLAY.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-05-22 | 1970-11-21 | 1971-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-22 | 1974-11-21 | 1975-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-22 | 1978-11-21 | 1979-05-23 | $7700.00 | Window Closed / Lapsed |