US3607798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Halogen treatment of aromatic polyamide-shaped articles
Assignee: Monsanto Co
•
Filing: 1967-07-17
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Granted: 1971-09-21
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Expires: 1987-07-17
Abstract
Abstract A process for the conversion of thermally stable aromatic polyamide-shaped articles into dimensionally stable fireproof products which involves a constructive heat treatment at elevated temperatures in an elemental halogen-containing atmosphere under carefully controlled conditions.
Inventors
- 👤 Stephen S Hirsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:23
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/126; D; D06; D06M; D06M11/00; D06M11/07; D06M11/09; C08J2377/00; C08J2377/10; Y; Y10; Y10S; Y10S260/00; Y10S260/24; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
21 words
causing said reaction to take place for a time in the range of from about 1 minute to about 12 hours.
Claim 2
Dependent Claim
12 words
The process of claim 1 wherein the polyamide is poly-m-phenylene bis(m-benzamido) terephthalamide.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the polyamide is poly-m-phenylene isophthalamide.
Claim 4
Dependent Claim
19 words
A cross-linked, partially dehydrogenated, partially halogenated, wholly aromatic polyamide-shaped article obtained in accordance with the process of claim 1.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |