US3682667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature insulation block
Assignee: United States Gypsum Co
•
Filing: 1970-06-18
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Granted: 1972-08-08
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Expires: 1990-06-18
Abstract
Abstract IMPROVED THERMAL-INSULATING MATERIAL IS MADE FROM AN ORGANIC BINDER, MINERAL WOOL, ASBESTOS FIBER, CLAY AND A WAX-SHAPED EMULSION.
Inventors
- 👤 James R Roberts
- 👤 Heber C Roach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:38
CPC Classifications
C; C04; C04B; C04B26/00; C04B26/02; C04B26/28; C04B26/285
Claims Analysis
Total Claims: 0
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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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |