US4698172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircraft anti-icing fluid containing carrageenan
Assignee: FMC Corp
•
Filing: 1986-08-04
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Granted: 1987-10-06
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Expires: 2006-08-04
Abstract
Abstract An anti-icing fluid suitable for ground treatment of aircraft, being a glycol-based solution containing a gel-forming carrageenan, in an amount of less than 5 wt %. The carrageenan is present in the glycol-based solution in an amount sufficient to thicken the fluid to promote its adherence to aircraft surfaces when applied to a stationary aircraft. Use of this thickened deicing fluid does not adversely affect airfoil lift characteristics during takeoff, because the fluid exhibits shear thinning and readily flows off the aircraft surfaces when exposed to wind shear during the aircraft's takeoff run.
Inventors
- 👤 Richard J. Tye
- 👤 George E. Lauterbach
- 👤 Philip R. Standel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:54
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/18
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
29 words
An anti-icing fluid suitable for ground treatment of aircraft which comprises a glycol-based aqueous solution thickened essentially with gel-forming carrageenan, in an amount of less than 5 wt %.
Claim 2
Dependent Claim
29 words
An anti-icing fluid suitable for ground treatment of aircraft which comprises a glycol-based aqueous solution thickened essentially with gel-forming carrageenan, in an amount of less than 5 wt %.
Claim 3
Dependent Claim
54 words
An anti-icing fluid suitable for ground treatment of aircraft which comprises a glycol-based aqueous solution containing gel-forming carrageenan in an amount sufficient to thicken the fluid to promote its adherence to aircraft surfaces when applied to a stationary aircraft but also allow for its wind shear-induced removal during the takeoff run prior to rotation.
Claim 4
Dependent Claim
54 words
An anti-icing fluid suitable for ground treatment of aircraft which comprises a glycol-based aqueous solution containing gel-forming carrageenan in an amount sufficient to thicken the fluid to promote its adherence to aircraft surfaces when applied to a stationary aircraft but also allow for its wind shear-induced removal during the takeoff run prior to rotation.
Claim 5
Dependent Claim
23 words
The composition of claim 1 or 2 wherein the carrageenan is present in an amount of from about 0.05 to 3 wt %.
Claim 6
Dependent Claim
23 words
The composition of claim 1 or 2 wherein the carrageenan is present in an amount of from about 0.1 to 1 wt %.
Claim 7
Dependent Claim
26 words
The composition of claim 1 or 2 wherein the glycol-based fluid contains one or more carrageenans selected from the group consisting of iota and kappa carrageenan.
Claim 8
Dependent Claim
16 words
The composition of claim 5 wherein the carrageenan component includes a substantial proportion of iota carrageenan.
Claim 9
Dependent Claim
29 words
The composition of claim 1 or 2 wherein the glycol-based fluid contains one or more glycols selected from the group consisting of ethylene glycol, diethylene glycol and propylene glycol.
Claim 10
Dependent Claim
16 words
The composition of claim 7 wherein the glycol component contains a major proportion of ethylene glycol.
Claim 11
Dependent Claim
15 words
The composition of claim 7 wherein the glycol component contains at least 80% ethylene glycol.
Claim 12
Dependent Claim
16 words
The composition of claim 8 wherein the glycol component contains a major portion of diethylene glycol.
Claim 13
Dependent Claim
26 words
The composition of claim 1 or 2 wherein the glycol component of the glycol-based fluid is present in an amount of at least 40 wt %.
Claim 14
Dependent Claim
23 words
The composition of claim 11 wherein the glycol component of the glycol-based fluid is present in an amount of from 50-95 wt %.
Claim 15
Dependent Claim
34 words
The composition of claim 1 or 2 wherein the glycol component of the glycol-based fluid is present in an amount sufficient to yield a freezing point for the fluid of less than -30° C.
Claim 16
Dependent Claim
26 words
The composition of claim 1 or 2 wherein the glycol and water components of the fluid constitute at least 90 wt % of the total composition.
Claim 17
Dependent Claim
26 words
The composition of claim 1 or 2 wherein the glycol and water components of the fluid constitute at least 95 wt % of the total composition.
Claim 18
Dependent Claim
15 words
The composition of claim 1 or 2 wherein the glycol-based fluid contains a corrosion inhibitor.
Claim 19
Dependent Claim
14 words
The composition of claim 1 or 2 wherein the glycol-based fluid contains a surfactant.
References Cited (Backward Citations)
US2373727A
Cited
US4501775A
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US4291025A
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US4358389A
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DE3142059A1
Cited
US4439337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-05 | 1991-04-06 | 1991-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-05 | 1995-04-06 | 1995-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-05 | 1999-04-06 | 1999-10-06 | $7700.00 | Window Closed / Lapsed |