Patent US3619058A successfully refreshed from Google Patents.
US4835304A
Expired / Lapsed
US
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High density ester damping fluids
Assignee: Charles Stark Draper Laboratory Inc
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Filing: 1987-05-01
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Granted: 1989-05-30
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Expires: 2007-05-01
Abstract
Abstract Esters having the general formula: ##STR1## where X is a halogen, n is 1-5, Y is an alkyl, ether, ester, or nitro substituent, m is 0-2, Z is an ester linkage --OCO-- or --CO 2 --, R' is a haloalkyl group, and p is 1-3, constitute high density flotation fluids for inertial instruments such as gyroscopes and accelerometers. Synthetic methods are disclosed for production of such fluids from available starting materials.
Inventors
- 👤 John R. Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:38
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/017
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
53 words
A compound having the formula ##STR32## wherein X is a halogen selected from the group consisting of fluorine, chlorine, bromine, and iodine, and n=2-5; Y is a substituent selected from the group consisting of --R and --OR, wherein R is an alkyl or haloalkyl group containing 1-2 carbon atoms, and m=0-2; and p=1-2.
Claim 2
Dependent Claim
53 words
A compound having the formula ##STR32## wherein X is a halogen selected from the group consisting of fluorine, chlorine, bromine, and iodine, and n=2-5; Y is a substituent selected from the group consisting of --R and --OR, wherein R is an alkyl or haloalkyl group containing 1-2 carbon atoms, and m=0-2; and p=1-2.
Claim 3
Dependent Claim
19 words
A compound of claim 1 wherein X is selected from the group consisting of bromine and iodine, and n=3-4.
Claim 4
Dependent Claim
13 words
A compound of claim 1 wherein Y is methyl or ethyl, and m=1.
Claim 5
Dependent Claim
10 words
A compound of claim 1 wherein the compound is (2,4,6-tribromophenyl)-2,2,3,4,4-pentafluoro-3,4-dibromo-butyrate.
Claim 6
Dependent Claim
10 words
A compound of claim 1 wherein the compound is (2,4,6-tribromoresorcinyl)-bis-2,2,3,4,4-pentafluoro-3,4-dibromo-butyrate.
Claim 7
Dependent Claim
10 words
A compound of claim 1 wherein the compound is (2,4,6-trichloro-3-ethyl-phenyl)-2,2,3,4,4-pentafluoro-3,4,-dibromo-butyrate.
Claim 8
Dependent Claim
10 words
A compound of claim 1 wherein the compound is (2,4,6-triiodophenyl)-2,2,3,4,4-pentafluoro-3,4-dibromo-butyrate.
Claim 9
Dependent Claim
10 words
A compound of claim 1 wherein the compound is (2,4,6-triiodo-3-bromo-phenyl)-2,2,3,4,4-pentafluoro-3,4,-dibromo-butyrate
Claim 10
Dependent Claim
10 words
A compound of claim 1 wherein the compound is (3-methyl-2,4,6-triiodophenyl)-2,2,3,4,4-pentafluoro-3,4-dibromo-butyrate.
Claim 11
Dependent Claim
10 words
A compound of claim 1 wherein the compound is (3-ethyl-2,4,6-triiodophenyl)-2,2,3,4,4-pentafluoro-3,4-dibromo-butyrate.
Claim 12
Dependent Claim
10 words
A compound of claim 1 wherein the compound is (2,3,4,6-tetrabromophenyl)-2,2,3,4,4-pentafluoro-3,4-dibromo-butyrate.
References Cited (Backward Citations)
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Cited
US3804885A
Cited
US4263157A
Cited
US4342877A
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US4719052A
Cited
US4572805A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |