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US3393820A
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Multi-wall high pressure chambers
Assignee: AT&T Inc
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Filing: 1966-02-03
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Granted: 1968-07-23
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Expires: 1986-02-03
Abstract
No abstract record available.
Inventors
- 👤 Jr Francis J Fuchs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:21
CPC Classifications
F; F16; F16J; F16J12/00; B; B01; B01J; B01J3/00; B01J3/04; B21; B21C; B21C23/00; B21C23/007; B21C27/00; B30; B30B; B30B11/00; B30B11/001; B30B11/002
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
43 words
A PRESSURE VESSEL COMPRISING: CONCENTRIC RINGS, SPACED APART AND RELATIVELY MOVABLE IN AXIAL DIRECTIONS; A MEDIUM IN SAID SPACE BETWEEN SAID RINGS; AND MEANS CONFINING SAID MEDIUM SO THAT RELATIVE AXIAL MOVEMENT BETWEEN SAID RINGS COMPRESSES THE MEDIUM TO DEVELOP RADIAL SUPPORT FORCES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-23 | 1972-01-22 | 1972-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-23 | 1976-01-22 | 1976-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-23 | 1980-01-22 | 1980-07-23 | $7700.00 | Window Closed / Lapsed |