US3760049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of firing dry spun refractory oxide fibers
Assignee: 3M Co
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Filing: 1971-03-01
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Granted: 1973-09-18
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Expires: 1991-03-01
Abstract
Abstract A viscous solution or dispersion of soluble or dispersed metal compounds is extruded from a spinnerette, the resulting continuous green fibers are drawn in air (preferably as a strand) and allowed to continuously accumulate or collect in a free-form, relaxed manner in the configuration of offset or superimposed loops on a moving belt which is continuously passed through a furnace to remove volatiles and burn off organic material, and the resulting continuous refractory fibers are continuously pulled in a straight or linear form through a furnace at higher temperature to densify, strengthen, straighten and/or modify the microstructure of the fibers or develop desired crystalline species therein.
Inventors
- 👤 A Borer
- 👤 G Krogseng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:16
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/62227; C04B35/62231; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
46 words
The process according to claim 1, wherein said extruded fibers are extruded through said orifices from a stationary spinnerette in the same direction and are continuously drawn in air, and the drawn fibers in the form of said green strand are then accumulated in said configuration.
Claim 2
Dependent Claim
81 words
The process according to claim 2, wherein said green strand is accumulated initially in a first moving pile of offset or superimposed loops of said green strand with the leading end thereof on the bottom of said pile, said first pile is turned over to form a second moving pile of offset or superimposed loops of said green strand with the leading end thereof on top of said second pile, and said second pile is subjected to said step of firing.
Claim 3
Dependent Claim
25 words
The process according to claim 3 wherein said firing is carried out in air to convert said strand into said continuous strand of refractory fibers.
Claim 4
Dependent Claim
35 words
The process according to claim 4 wherein said recovered strand of refractory fibers is continuously passed in the form of a linear strand under tension through a furnace and further fired at a higher temperature.
Claim 5
Dependent Claim
34 words
The process according to claim 5, wherein said green fibers are extruded from a viscous aqueous dispersion of colloidal silica in basic aluminum acetate, Al(OH)2(OOCCH3).1/3 H3BO3, and the resulting refractory fibers comprise aluminum borosilicate.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |