Patent US3140535A successfully refreshed from Google Patents.
US3140535A
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Autofrettage method and apparatus
Assignee: Hahn and Clay
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Filing: 1963-05-31
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Granted: 1964-07-14
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Expires: 1983-05-31
Abstract
No abstract record available.
Inventors
- 👤 Raymond E Pechacek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:18
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/24; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49938; Y10T29/4994
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A METHOD OF APPLYING PRESSURE INTERNALLY OF A CYLINDER WALL FOR THE AUTO-FRETTAGE THEREOF, COMPRISING THE STEPS OF, (A) APPLYING INTERNAL PRESSURE ONLY RADIALLY OUTWARDLY OF A CYLINDER WALL FOR ONLY A PORTION OF THE LENGTH THEREOF TO EXPAND THE INNER PART OF SAID PORTION, (B) RELEASING THE PRESSURE ON SAID PORTION, (C) THEREAFTER REPEATING THE FOREGOING STEPS OF APPLYING THE INTERNAL PRESSURE AND RELEASING SAME ON SUCCESSIVE LENGTHWISE INTERNAL PORTIONS OF SAID CYLINDER WALL, (D) EACH OF SAID PORTIONS EXTENDING COMPLETELY AROUND THE INTERNAL CIRCUMFERENCE OF THE CYLINDER, AND (E) SAID PRESSURE BEING APPLIED BY MEANS OF AN EXPANSIBLE ANNULAR BAND HAVING MEANS FOR FLUID PRESSURE TO EXPAND THE ANNULAR BAND TO FLEX SAME RADIALLY OUTWARDLY.
Claim 2
Independent Claim
117 words
A METHOD OF APPLYING PRESSURE INTERNALLY OF A CYLINDER WALL FOR THE AUTO-FRETTAGE THEREOF, COMPRISING THE STEPS OF, (A) APPLYING INTERNAL PRESSURE ONLY RADIALLY OUTWARDLY OF A CYLINDER WALL FOR ONLY A PORTION OF THE LENGTH THEREOF TO EXPAND THE INNER PART OF SAID PORTION, (B) RELEASING THE PRESSURE ON SAID PORTION, (C) THEREAFTER REPEATING THE FOREGOING STEPS OF APPLYING THE INTERNAL PRESSURE AND RELEASING SAME ON SUCCESSIVE LENGTHWISE INTERNAL PORTIONS OF SAID CYLINDER WALL, (D) EACH OF SAID PORTIONS EXTENDING COMPLETELY AROUND THE INTERNAL CIRCUMFERENCE OF THE CYLINDER, AND (E) SAID PRESSURE BEING APPLIED BY MEANS OF AN EXPANSIBLE ANNULAR BAND HAVING MEANS FOR FLUID PRESSURE TO EXPAND THE ANNULAR BAND TO FLEX SAME RADIALLY OUTWARDLY.
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) | 1967-07-14 | 1968-01-13 | 1968-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-14 | 1972-01-13 | 1972-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-14 | 1976-01-13 | 1976-07-14 | $7700.00 | Window Closed / Lapsed |