US3143794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making flexible metallic bellows
Assignee: Teddington Aircraft Controls Ltd
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Filing: 1960-08-18
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Granted: 1964-08-11
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Expires: 1980-08-18
Abstract
No abstract record available.
Inventors
- 👤 William F F Martin-Hurst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:09
CPC Classifications
B; B21; B21D; B21D15/00; B21D15/04; B21D15/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49877; Y10T29/49908; Y10T29/49925; Y10T29/49927; Y10T29/49929
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
183 words
THE METHOD OF MANUFACTURING AN INTERNALLY REINFORCED FLEXIBLE METALLIC BELLOWS WHICH COMPRISES THE STEPS OF INSERTING AXIALLY INTO A STRAIGHT-WALLED TUBE OF THIN METAL A RIGID CONTINUOUS RING HAVING AN OUTER DIAMETER CORRESPONDING TO THE INNER DIAMETER OF SAID TUBE, SUPPORTING SAID TUBE WALL AND INSERTED RING ON AXIALLY SPACED MANDREL ROLLERS, TRANSVERSELY DEFORMING THE TUBE WALL BETWEEN SAID ROLLERS TO EXTERNALLY GROOVE THE TUBE THEREBETWEEN, AXIALLY INSERTING A SECOND SIMILAR RIGID CONTINUOUS RING INTO SAID TUBE AND AGAINST THE WALL OF SAID GROOVE IN THE BORE OF SAID TUBE ON THE SIDE OF SAID GROOVE OPPOSITE SAID FIRST RING, SUPPORTING THE TUBE WALL ON THE SIDE OF SAID GROOVE OPPOSITE SAID FIRST RING AND SAID SECOND RING ON SAID AXIALLY SPACED MANDREL ROLLERS, TRANSVERSELY DEFORMING SAID TUBE WALL BETWEEN SAID ROLLERS TO EXTERNALLY GROOVE SAID TUBE THEREBETWEEN AND THEREBY FORM A SECOND EXTERNAL GROOVE IN SAID TUBE WALL AND SECURE SAID SECOND RING AXIALLY BETWEEN SAID GROOVES, AND REPEATING THE FOREGOING STEPS UNTIL A DESIRED NUMBER OF AXIALLY SPACED REINFORCING RINGS HAVE BEEN MOUNTED WITHIN SAID TUBE AND SECURED BETWEEN SAID GROOVES.
Claim 2
Independent Claim
183 words
THE METHOD OF MANUFACTURING AN INTERNALLY REINFORCED FLEXIBLE METALLIC BELLOWS WHICH COMPRISES THE STEPS OF INSERTING AXIALLY INTO A STRAIGHT-WALLED TUBE OF THIN METAL A RIGID CONTINUOUS RING HAVING AN OUTER DIAMETER CORRESPONDING TO THE INNER DIAMETER OF SAID TUBE, SUPPORTING SAID TUBE WALL AND INSERTED RING ON AXIALLY SPACED MANDREL ROLLERS, TRANSVERSELY DEFORMING THE TUBE WALL BETWEEN SAID ROLLERS TO EXTERNALLY GROOVE THE TUBE THEREBETWEEN, AXIALLY INSERTING A SECOND SIMILAR RIGID CONTINUOUS RING INTO SAID TUBE AND AGAINST THE WALL OF SAID GROOVE IN THE BORE OF SAID TUBE ON THE SIDE OF SAID GROOVE OPPOSITE SAID FIRST RING, SUPPORTING THE TUBE WALL ON THE SIDE OF SAID GROOVE OPPOSITE SAID FIRST RING AND SAID SECOND RING ON SAID AXIALLY SPACED MANDREL ROLLERS, TRANSVERSELY DEFORMING SAID TUBE WALL BETWEEN SAID ROLLERS TO EXTERNALLY GROOVE SAID TUBE THEREBETWEEN AND THEREBY FORM A SECOND EXTERNAL GROOVE IN SAID TUBE WALL AND SECURE SAID SECOND RING AXIALLY BETWEEN SAID GROOVES, AND REPEATING THE FOREGOING STEPS UNTIL A DESIRED NUMBER OF AXIALLY SPACED REINFORCING RINGS HAVE BEEN MOUNTED WITHIN SAID TUBE AND SECURED BETWEEN SAID GROOVES.
References Cited (Backward Citations)
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US1561065A
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FR708598A
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US2153173A
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US2373680A
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US2446281A
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US2823702A
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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) | 1967-08-11 | 1968-02-10 | 1968-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-11 | 1972-02-10 | 1972-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-11 | 1976-02-10 | 1976-08-11 | $7700.00 | Window Closed / Lapsed |