Patent US5213476A successfully refreshed from Google Patents.
US5213476A
Expired / Lapsed
US
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Fan blade
Assignee: Hudson Products Corp
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Filing: 1992-05-26
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Granted: 1993-05-25
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Expires: 2012-05-26
Abstract
Abstract A molded hollow fan blade in which a preform (preferably constructed of glass fibers) is used to support the upper multiple layers of to-be-impregnated cloth within a mold. As resin is injected into the mold, the cloth and the preform become impregnated (this resin dissolving the temporary resin binder holding the preform together) thereby bonding the two together to form a single unit during the molding operation.
Inventors
- 👤 Robert C. Monroe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:27
CPC Classifications
B; B29; B29D; B29D99/00; B29D99/0025; B29D99/0028; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/42; B29C70/44; B29C70/443; B29C70/446; B29C70/54; B29C70/541; B29C43/00; B29C43/02; B29C43/10; B29C43/12; B29L; B29L2031/00; B29L2031/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
86 words
A molded, hollow fan blade constructed of upper and lower layers of resin-impregnated glass fan fiber cloths and having an internal cavity therein, wherein the improvement comprises: (a) a solitary, cured, glass fiber preform within the fan blade and defining a portion of the internal cavity therein, said preform configured to engage and solely support the upper layers of the cloths and comprising a unitary, stationary, curved, panel; and, (b) resin binding means for integrally bonding said preform solely to the upper layers of the cloths.
Claim 2
Dependent Claim
86 words
A molded, hollow fan blade constructed of upper and lower layers of resin-impregnated glass fan fiber cloths and having an internal cavity therein, wherein the improvement comprises: (a) a solitary, cured, glass fiber preform within the fan blade and defining a portion of the internal cavity therein, said preform configured to engage and solely support the upper layers of the cloths and comprising a unitary, stationary, curved, panel; and, (b) resin binding means for integrally bonding said preform solely to the upper layers of the cloths.
Claim 3
Dependent Claim
36 words
The apparatus as set forth in claim 1 wherein said preform is initially held together by a temporary resin binder and wherein said resin binding means replaces said temporary resin binder in the finished fan blade.
Claim 4
Dependent Claim
17 words
The apparatus as set forth in claim 2 wherein said preform is constructed of chopped glass fibers.
Claim 5
Dependent Claim
18 words
The apparatus as set forth in claim 2 wherein said preform is constructed of continuous strand glass fibers.
Claim 6
Dependent Claim
18 words
The apparatus as set forth in claim 2 wherein said preform is constructed of a glass fiber mat.
Claim 7
Dependent Claim
28 words
The apparatus as set forth in claim 2 wherein the fan blade is of hollow one piece construction comprising both a neck portion and an air foil portion.
References Cited (Backward Citations)
FR494954A
Cited
US2945262A
Cited
US3967996A
Cited
US3902944A
Cited
US4169749A
Cited
US4268571A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-24 | 1996-11-23 | 1997-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-24 | 2000-11-23 | 2001-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-24 | 2004-11-23 | 2005-05-25 | $7700.00 | Window Closed / Lapsed |