US3650102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibers from novolacs
Assignee: Unifrax I LLC
•
Filing: 1968-03-04
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Granted: 1972-03-21
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Expires: 1988-03-04
Abstract
Abstract A novolac melt is fiberized to produce a thermoplastic, uncured novolac fiber, and the novolac is cured by heating the fiber in a formaldehyde environment in the presence of an acid catalyst to obtain an infusible, cured novolac fiber.
Inventors
- 👤 James Economy
- 👤 Rodger A Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:17
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/76; Y; Y10; Y10S; Y10S428/00; Y10S428/903; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/298; Y10T442/00; Y10T442/30; Y10T442/3065; Y10T442/3976; Y10T442/3984
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
15 words
A novolac fiber according to claim 1 wherein said novolac is a phenol formaldehyde novolac.
Claim 2
Dependent Claim
22 words
A novolac fiber according to claim 1 having a diameter within the range of from about 0.1 micron to about 300 microns.
Claim 3
Dependent Claim
15 words
An infusible cured novolac fiber comprising the reaction product of a novolac and an aldehyde.
Claim 4
Dependent Claim
8 words
A fibrous product comprising infusible cured novolac fibers.
Claim 5
Dependent Claim
13 words
A fibrous product according to claim 5 wherein the same is a yarn.
Claim 6
Dependent Claim
13 words
A fibrous product according to claim 5 wherein the same is a fabric.
Claim 7
Dependent Claim
12 words
A fibrous product according to claim 7 wherein said fabric is woven.
Claim 8
Dependent Claim
14 words
A novolac fiber according to claim 26 having a maximum diameter of 25 microns.
Claim 9
Dependent Claim
24 words
A novolac fiber accordinG to claim 24 having a tensile strength of at least 15,000 p.s.i. and a break elongation of at least 3%.
Claim 10
Dependent Claim
18 words
A novolac fiber according to claim 33 having an elastic modulus of at least 0.5 X 106 p.s.i.
Claim 11
Dependent Claim
13 words
A fibrous product according to claim 28 consisting of infusible cured novolac fibers.
References Cited (Backward Citations)
FR860045A
Cited
US2535373A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |