Patent US4451118A successfully refreshed from Google Patents.
US4451118A
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US
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Composite laser mirror
Assignee: RTX Corp
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Filing: 1980-12-23
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Granted: 1984-05-29
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Expires: 2000-12-23
Abstract
Abstract A laser mirror is described having a base section, a backing section, and a laser radiation reflecting surface. The base section and backing section are formed of graphite fiber reinforced glass. The fibers in the base section are oriented in a plane parallel to the laser radiation reflecting surface. The fibers in the backing section are oriented in a plane perpendicular to the radii of the reflecting surface. Based on the materials employed and the orientation of the fibers, a laser mirror with improved thermal distortion properties results.
Inventors
- 👤 Robert K. Stalcup
- 👤 Warren R. Sigman
- 👤 Karl M. Prewo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:14
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/08; B; B32; B32B; B32B5/00; B32B5/02; B32B5/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
A laser mirror comprising a base section attached to a backing section having a laser radiation reflecting surface, the base section comprising a glass matrix reinforced with a plurality of graphite fibers oriented in at least one plane parallel to the mirror surface, the backing section disposed between the base section and the reflecting surface and comprising a glass matrix reinforced with a plurality of graphite fibers oriented perpendicular to the reflecting surface.
Claim 2
Dependent Claim
73 words
A laser mirror comprising a base section attached to a backing section having a laser radiation reflecting surface, the base section comprising a glass matrix reinforced with a plurality of graphite fibers oriented in at least one plane parallel to the mirror surface, the backing section disposed between the base section and the reflecting surface and comprising a glass matrix reinforced with a plurality of graphite fibers oriented perpendicular to the reflecting surface.
Claim 3
Dependent Claim
34 words
The laser mirror of claim 1 which additionally contains graphite fibers in the backing section oriented perpendicular to the radii of the reflecting surface in at least one plane parallel to the reflecting surface.
Claim 4
Dependent Claim
13 words
The laser mirror of claim 1 having coolant passages in the backing section.
Claim 5
Dependent Claim
13 words
The laser mirror of claim 1 having coolant passages in the base section.
Claim 6
Dependent Claim
40 words
The laser mirror of claims 1, 2 or 3 containing 40-70% volume graphite fibers, and having a graphite fiber orientation in the base section of the composite of 0° and 90°; 0°, 45° and 90°; or 0 ° and 60°.
Claim 7
Dependent Claim
16 words
The laser mirror of claims 1, 2 or 3 containing about 60% by volume graphite fiber.
Claim 8
Dependent Claim
14 words
The laser mirror of claims 1, 2 or 3 wherein the glass comprises borosilicate.
Claim 9
Dependent Claim
40 words
The laser mirror of claims 1, 2 or 3 wherein the graphite fiber has a modulus of elasticity of at least 531 GPa, a tensile strength of at least 1724 MPa and a density of about 1.96 gm/cm 3 .
Claim 10
Dependent Claim
30 words
The laser mirror of claims 3 or 4 wherein the cooling channels are in a plane substantially parallel to the laser radiation reflecting surface and substantially parallel to each other.
References Cited (Backward Citations)
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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) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |