Patent DE609508C successfully refreshed from Google Patents.
Patent US3718830A successfully refreshed from Google Patents.
US3718830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid cooled rotor for dynamoelectric machines
Assignee: Westinghouse Electric Corp
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Filing: 1971-07-08
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Granted: 1973-02-27
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Expires: 1991-07-08
Abstract
Abstract A cooling system is provided for liquid cooled rotors including an improved insulating hose member incorporated in the cooling system to supply coolant liquid to the rotor winding. The improved hose member is a plastic tube with metal fittings enclosed in and reinforced by a glass filament wound housing which extends over the tube and axially beyond the metal fittings to form a substantially rigid, leak-proof, insulating hose member.
Inventors
- 👤 H Philofsky
- 👤 S Ying
- 👤 J Chottiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:00
CPC Classifications
H; H02; H02K; H02K9/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
12 words
The structure of claim 1 in which said plastic tube is polytetrafluoroethylene.
Claim 2
Dependent Claim
63 words
The structure of claim 1 in which said housing comprises an inner layer of insulating material covering the plastic tube and fittings and providing a smooth cylindrical surface and an outer winding of glass filaments wound tightly over the inner layer and extending axially over the metal fittings, said glass filaments being impregnated with a thermosetting resin and baked to cure the resin.
Claim 3
Dependent Claim
21 words
The structure of claim 3 in which said inner layer of insulating material comprises glass filaments impregnated with a thermosetting resin.
Claim 4
Dependent Claim
12 words
The structure of claim 3 in which the plastic tube is polytetrafluoroethylene.
References Cited (Backward Citations)
US3232640A
Cited
US3226137A
Cited
US3308316A
Cited
US3469125A
Cited
US3440594A
Cited
US3524090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |