Patent US3292991A successfully refreshed from Google Patents.
US3292991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of fire-proofing a blend of ceramic fibers and acrylic resin fibers by heating in an oxidizing atmosphere
Assignee: Unifrax I LLC
•
Filing: 1963-05-14
•
Granted: 1966-12-20
•
Expires: 1983-05-14
Abstract
No abstract record available.
Inventors
- 👤 William P Crawley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:39
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/32; D06M11/34; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A HEAT TREATING PROCESS FOR RENDERING SUBSTANTIALLY FIREPROOF A FIBROUS PRODUCT COMPRISING AN INTIMATE FIBER BLEND CONSISTING ESSENTIALLY OF STAPLE, INORGANIC, SILICEOUS CERAMIC FIBERS, AND STAPLE, ACRYLIC CARRIER FIBERS HAVING A SOFTENING POINT ABOVE ABOUT 320* F., SAID PROCESS COMPRISING SUBJECTING SAID PRODUCT TO NON-COMBUSTIVE HEAT TREATMENT IN AN OXIDIZING ATMOSPHERE AT A TEMPERATURE ABOVE SAID SOFTENING POINT FOR A PERIOD OF TIME SUFFICIENT TO CONVERT SAID CARRIER FIBERS TO SUBSTANTIALLY NON-FLAMMABLE, HEAT-RESISTANT FORM.
Claim 2
Dependent Claim
74 words
A HEAT TREATING PROCESS FOR RENDERING SUBSTANTIALLY FIREPROOF A FIBROUS PRODUCT COMPRISING AN INTIMATE FIBER BLEND CONSISTING ESSENTIALLY OF STAPLE, INORGANIC, SILICEOUS CERAMIC FIBERS, AND STAPLE, ACRYLIC CARRIER FIBERS HAVING A SOFTENING POINT ABOVE ABOUT 320* F., SAID PROCESS COMPRISING SUBJECTING SAID PRODUCT TO NON-COMBUSTIVE HEAT TREATMENT IN AN OXIDIZING ATMOSPHERE AT A TEMPERATURE ABOVE SAID SOFTENING POINT FOR A PERIOD OF TIME SUFFICIENT TO CONVERT SAID CARRIER FIBERS TO SUBSTANTIALLY NON-FLAMMABLE, HEAT-RESISTANT FORM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-19 | 1970-06-20 | 1970-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-19 | 1974-06-20 | 1974-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-19 | 1978-06-20 | 1978-12-20 | $7700.00 | Window Closed / Lapsed |