Method of fabricating an integrated piston and cylinder mechanism and valve assembly
Abstract
Abstract A method and apparatus for fabricating the housing of an integrated piston and cylinder mechanism and control valve. The housing is formed by placing in a cavity defined by complementary mold sections a cylinder tube, a control valve tube and an inlet tube, with the three tubes properly positioned in the mold cavity and with respect to each other by means of removable mandrels. Openings through the tubes, which serve as fluid passages in the completed assembly, are kept open as hardenable material is injected into the mold cavity by means of core pins or lugs projecting from the mandrels and extending through the openings in one tube into the corresponding openings in an adjacent tube.
Inventors
- 👤 J Keefe
- 👤 E Finke
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |