Patent US3773583A successfully refreshed from Google Patents.
US3773583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-stage filament winding of t-shaped hollow products
Assignee: Rheem Fluid Systems Inc
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Filing: 1971-12-17
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Granted: 1973-11-20
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Expires: 1991-12-17
Abstract
Abstract A two stage method of making a T-shaped hollow product of reinforcing material impregnated with a synthetic resin. During the first stage, the synthetic resin impregnated reinforcing material is wound at various angles around a mandrel body carrying a laterally extending, bullet shaped neck portion, any windings which engage the bullet shaped neck portion sliding laterally inwardly therealong to regions adjacent the base thereof. In the second stage, the bullet shaped neck portion is replaced by a second neck portion at least part of which is generally cylindrical, the synthetic resin impregnated reinforcing material being wound around such second neck portion to form the leg of the T-shaped hollow product. The result of this two stage technique is a concentration of winding material at the junction of the body and the neck of the T-shaped hollow product for greater strength.
Inventors
- 👤 R Quirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:48
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/56; B29C53/58; B29C53/76; B29K; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/10; B29L; B29L2031/00; B29L2031/24; B29L2031/246
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
100 words
A method of making a hollow product, including the steps of: a. providing a generally cylindrical mandrel body; b. connecting to said mandrel body a laterally extending, bullet shaped, neck portion; c. winding synthetic resin impregnated reinforcing material around said mandrel body at various angles thereto, any windings which engage said bullet shaped neck portion sliding laterally inwardly therealong to regions adjacent the base thereof; d. replacing said bullet shaped neck portion with a second neck portion at least part of which is generally cylindrical; and e. wInding synthetic resin impregnated reinforcing material at least around said second neck portion.
Claim 2
Independent Claim
100 words
A method of making a hollow product, including the steps of: a. providing a generally cylindrical mandrel body; b. connecting to said mandrel body a laterally extending, bullet shaped, neck portion; c. winding synthetic resin impregnated reinforcing material around said mandrel body at various angles thereto, any windings which engage said bullet shaped neck portion sliding laterally inwardly therealong to regions adjacent the base thereof; d. replacing said bullet shaped neck portion with a second neck portion at least part of which is generally cylindrical; and e. wInding synthetic resin impregnated reinforcing material at least around said second neck portion.
Claim 3
Independent Claim
114 words
A method of making a T-shaped hollow product, including the steps of: a. providing a generally cylindrical mandrel body having longitudinally spaced end portions; b. connecting to said mandrel body intermediate its end portions a laterally extending, bullet shaped, neck portion; c. winding synthetic resin impregnated reinforcing material around said mandrel body at various angles to the longitudinal axis thereof, any windings which engage said bullet shaped neck portion sliding laterally inwardly therealong to regions adjacent the base thereof; d. replacing said bullet shaped neck portion with a second neck portion at least part of which is generally cylindrical; and e. winding synthetic resin impregnated reinforcing material at least around said second neck portion.
Claim 4
Independent Claim
114 words
A method of making a T-shaped hollow product, including the steps of: a. providing a generally cylindrical mandrel body having longitudinally spaced end portions; b. connecting to said mandrel body intermediate its end portions a laterally extending, bullet shaped, neck portion; c. winding synthetic resin impregnated reinforcing material around said mandrel body at various angles to the longitudinal axis thereof, any windings which engage said bullet shaped neck portion sliding laterally inwardly therealong to regions adjacent the base thereof; d. replacing said bullet shaped neck portion with a second neck portion at least part of which is generally cylindrical; and e. winding synthetic resin impregnated reinforcing material at least around said second neck portion.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |