US4898991A
Expired / Lapsed
US
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New perfluoropolyethers
Assignee: EIDP Inc
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Filing: 1989-01-30
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Granted: 1990-02-06
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Expires: 2009-01-30
Abstract
Abstract New perfluoropolyethers, such as perfluoro-4,7,10-trioxa-5-methyleicosane, are useful as vapor phase soldering fluids and convection cooling liquids.
Inventors
- 👤 Hsu-Nan Huang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:02
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/02; C07C43/03; C07C43/04; C07C43/12; C07C43/126
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
27 words
Perfluoropolyether compounds of the formula: ##STR12## where: a=1-6; b=0-2, with the proviso that when b=0, R=CF 3 , and when b=1 or 2, R=F; c=0-8; and d=5-18.
Claim 2
Dependent Claim
27 words
Perfluoropolyether compounds of the formula: ##STR12## where: a=1-6; b=0-2, with the proviso that when b=0, R=CF 3 , and when b=1 or 2, R=F; c=0-8; and d=5-18.
Claim 3
Dependent Claim
16 words
The compound of claim 1 which is perfluoro-2,5-dioxadecane of the formula: CF.sub.3 OCF.sub.2 CF.sub.2 O(CF.sub.2).sub.5 F.
Claim 4
Dependent Claim
19 words
The compound of claim 1 which is perfluoro-2,6,9-trioxapentadecane of the formula: CF.sub.3 OCF.sub.2 CF.sub.2 CF.sub.2 OCF.sub.2 CF.sub.2 O(CF.sub.2).sub.6 F.
Claim 5
Dependent Claim
12 words
The compound of claim 1 which is perfluoro-2,5,8-trioxa-3-methyl-tridecane of the formula: ##STR13##
Claim 6
Dependent Claim
12 words
The compound of claim 1 which is perfluoro-4,7-dioxa-5-methyl-pentadecane of the formula: ##STR14##
Claim 7
Dependent Claim
12 words
A compound of claim 1 which is perfluoro-4,7,10-trioxa-5-methyleicosane of the formula: ##STR15##
Claim 8
Dependent Claim
18 words
A compound of claim 1 which is perfluoro-4,7-dioxapentadecane of the formula: CF.sub.3 CF.sub.2 CF.sub.2 OCF.sub.2 CF.sub.2 O(CF.sub.2).sub.7 CF.sub.3.
Claim 9
Dependent Claim
18 words
A compound of claim 1 which is perfluoro-4,7-dioxaheptadecane of the formula: CF.sub.3 CF.sub.2 CF.sub.2 OCF.sub.2 CF.sub.2 O(CF.sub.2).sub.9 CF.sub.3.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |