US3883942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of providing a fluid tight seal between a thin walled tube and a piston
Assignee: FMC Corp
•
Filing: 1974-02-08
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Granted: 1975-05-20
•
Expires: 1994-02-08
Abstract
Abstract A smoke spotting cartridge adapted upon ejection to propel a smoke forming chemical or the like high into the air for ease in spotting.
Inventors
- 👤 Jr Arthur A Fichter
- 👤 Ronald D Danks
- 👤 Farrell G Larsen
- 👤 Jr Guy C Throner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:24
CPC Classifications
B; B23; B23P; B23P11/00; B23P11/02; F; F42; F42B; F42B12/00; F42B12/02; F42B12/36; F42B12/46; F42B12/48; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49908; Y10T29/49915; Y10T29/49917; Y10T29/49925; Y10T29/49927; Y10T29/49929
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
120 words
A method of providing a fluid tight seal between a thin walled tube and a piston which includes a pair of relatively moving rigid members with a deformable member disposed therebetween comprising the steps of; inserting the piston member into the tube, applying a compressive force to the rigid members to move the rigid members toward each other to radially expand the deformable member against the internal surface of the tube, deforming the tube for releasably locking each of the rigid members in their compressed positions to the tube, and inwardly annularly crimping the walls of the tube against the compressed deformable piston member to radially compress a portion of the deformable piston member to provide a fluid tight seal.
Claim 2
Independent Claim
120 words
A method of providing a fluid tight seal between a thin walled tube and a piston which includes a pair of relatively moving rigid members with a deformable member disposed therebetween comprising the steps of; inserting the piston member into the tube, applying a compressive force to the rigid members to move the rigid members toward each other to radially expand the deformable member against the internal surface of the tube, deforming the tube for releasably locking each of the rigid members in their compressed positions to the tube, and inwardly annularly crimping the walls of the tube against the compressed deformable piston member to radially compress a portion of the deformable piston member to provide a fluid tight seal.
Claim 3
Dependent Claim
30 words
A method according to claim 1 wherein said compressive forces are applied to the rigid members by inwardly deforming portions of the tube against opposed edges of the rigid members.
Claim 4
Dependent Claim
75 words
A method according to claim 1 wherein the steps occur in the following order: first, deforming the tube against one of the rigid members to releasably lock the member to the tube, then applying the compressive force to the rigid piston members, thereafter deforming the tube to lock the other rigid member is position which compresses and radially expands the deformable piston member, and finally applying the inward annular crimp against the deformable piston member.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |