Patent US4708419A successfully refreshed from Google Patents.
US4708419A
Expired / Lapsed
US
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Protection of IR sensitive equipment
Assignee: Dornier System GmbH
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Filing: 1984-09-12
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Granted: 1987-11-24
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Expires: 2004-09-12
Abstract
Abstract Certain thermoplastics, notably high molecular weight, oriented amorphous or partially crystralline polyethylene are used as a cover for or directly as a window for IR equipment in aircraft, permitting direct exposure to the environment.
Inventors
- 👤 Werner Scherber
- 👤 Hans W. Schroeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:01
CPC Classifications
B; B60; B60J; B60J1/00; B60J1/20; B60J1/2094; C; C09; C09D; C09D5/00; C09D5/16; G02B1/105; G; G02; G02B; G02B1/00; G02B1/10; G02B1/14; C08; C08L; C08L2207/00; C08L2207/06; C08L2207/068; C08L23/00; C08L23/02; C08L23/04; C08L23/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
60 words
The method of protecting infrared equipment in aircraft against rain erosion, the equipment being sensitive to radiation in the range from 8 to 13.5 micrometer wavelength, comprising the step of using a cover or window transmissive to radiation in said wavelength range and consisting of a thermoplastic synthetic selected from the group consisting of polyetheretherketone, perfluoroalkoxy copolymer, polyethersulfone, polyacetal, polyamide.
Claim 2
Independent Claim
60 words
The method of protecting infrared equipment in aircraft against rain erosion, the equipment being sensitive to radiation in the range from 8 to 13.5 micrometer wavelength, comprising the step of using a cover or window transmissive to radiation in said wavelength range and consisting of a thermoplastic synthetic selected from the group consisting of polyetheretherketone, perfluoroalkoxy copolymer, polyethersulfone, polyacetal, polyamide.
Claim 3
Dependent Claim
27 words
The method as in claim 1, comprising the step of using a thermoplastic material being amorphous or partially crystalline with crystallites smaller than said wave length range.
Claim 4
Dependent Claim
25 words
The method as in claim 1, comprising the step of using a thermoplastic synthetic having ultra high strength due to oriented solidification of its molecules.
Claim 5
Dependent Claim
30 words
The method as in claim 1, including the additional step of applying said synthetic material through a melt adhesion process so that the synthetic material will adhere to said equipment.
Claim 6
Independent Claim
50 words
The method of protecting infrared equipment in aircraft against rain erosion, the equipment being sensitive to radiation in the range from 8 to 13.5 micrometer wavelength, comprising the step of using a cover or window transmissive to radiation in said wavelength range and consisting of a fluoro containing thermoplastic material.
Claim 7
Independent Claim
50 words
The method of protecting infrared equipment in aircraft against rain erosion, the equipment being sensitive to radiation in the range from 8 to 13.5 micrometer wavelength, comprising the step of using a cover or window transmissive to radiation in said wavelength range and consisting of a fluoro containing thermoplastic material.
Claim 8
Independent Claim
59 words
The method of protecting infrared equipment in aircraft against rain erosion, the equipment being sensitive to radiation in the range from 8 to 13.5 micrometer wavelength, comprising the step of using a cover or window transmissive to radiation in said wavelength range and consisting of an ultrahigh molecular weight polyethylene having a molecular weight in excess of one million.
Claim 9
Independent Claim
59 words
The method of protecting infrared equipment in aircraft against rain erosion, the equipment being sensitive to radiation in the range from 8 to 13.5 micrometer wavelength, comprising the step of using a cover or window transmissive to radiation in said wavelength range and consisting of an ultrahigh molecular weight polyethylene having a molecular weight in excess of one million.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-23 | 1991-05-25 | 1991-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-23 | 1995-05-25 | 1995-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-23 | 1999-05-25 | 1999-11-24 | $7700.00 | Window Closed / Lapsed |