Patent US3475176A successfully refreshed from Google Patents.
Patent US3358488A successfully refreshed from Google Patents.
US3358488A
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US
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Method and apparatus for increasing the ductility of an article during a forming operation
Assignee: AT&T Inc
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Filing: 1965-06-03
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Granted: 1967-12-19
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Expires: 1985-06-03
Abstract
No abstract record available.
Inventors
- 👤 Jr Francis J Fuchs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:31
CPC Classifications
B; B21; B21D; B21D15/00; B21D15/04; B21D15/10; B21D26/00; B21D26/02; B21D26/033; B21D26/041; B21D26/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A METHOD OF EXPANDING A HOLLOW TUBE TO AN ENLARGED DIAMETER, COMPRISING: APPLYING FLUID PRESSURE TO THE INTERIOR AND EXTERIOR OF THE TUBE OF MAGNITUDES SUFFICIENT TO RENDER THE TUBE MORE DUCTILE; AND INCREASING THE FLUID PRESSURE APPLIED TO THE INTERIOR OF THE TUBE OVER THE FLUID PRESSURE APPLIED TO THE EXTERIOR OF THE TUBE BY AN AMOUNT SUFFICIENT TO EXPAND THE MORE DUCTILE TUBE TO THE ENLARGED DIAMETER.
Claim 2
Independent Claim
69 words
A METHOD OF EXPANDING A HOLLOW TUBE TO AN ENLARGED DIAMETER, COMPRISING: APPLYING FLUID PRESSURE TO THE INTERIOR AND EXTERIOR OF THE TUBE OF MAGNITUDES SUFFICIENT TO RENDER THE TUBE MORE DUCTILE; AND INCREASING THE FLUID PRESSURE APPLIED TO THE INTERIOR OF THE TUBE OVER THE FLUID PRESSURE APPLIED TO THE EXTERIOR OF THE TUBE BY AN AMOUNT SUFFICIENT TO EXPAND THE MORE DUCTILE TUBE TO THE ENLARGED DIAMETER.
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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) | 1970-12-18 | 1971-06-19 | 1971-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-18 | 1975-06-19 | 1975-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-18 | 1979-06-19 | 1979-12-19 | $7700.00 | Window Closed / Lapsed |