Patent US3560591A successfully refreshed from Google Patents.
Patent US3209570A successfully refreshed from Google Patents.
US3209570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control device
Assignee: Walker Manufacturing Co
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Filing: 1962-09-28
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Granted: 1965-10-05
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Expires: 1982-09-28
Abstract
No abstract record available.
Inventors
- 👤 Bert A Hills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:55
CPC Classifications
B; B21; B21D; B21D7/00; B21D7/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
THE METHOD OF BENDING A TUBULAR MEMBER COMPRISING THE STEPS OF APPLYING A BENDING PRESSURE, APPLYING BACK PRESSURE IN THE AREA OF BEND, AND SIMULTANEOUSLY AUTOMATICALLY VARYING THE BACK PRESSURE APPLIED IN THE AREA OF THE BEND DURING THE BENDING OPERATION IN ACCORD ANCE WITH THE DEGREE OF ANGULARITY OF BEND ATTAINED.
Claim 2
Independent Claim
52 words
THE METHOD OF BENDING A TUBULAR MEMBER COMPRISING THE STEPS OF APPLYING A BENDING PRESSURE, APPLYING BACK PRESSURE IN THE AREA OF BEND, AND SIMULTANEOUSLY AUTOMATICALLY VARYING THE BACK PRESSURE APPLIED IN THE AREA OF THE BEND DURING THE BENDING OPERATION IN ACCORD ANCE WITH THE DEGREE OF ANGULARITY OF BEND ATTAINED.
References Cited (Backward Citations)
US2255985A
Cited
US2464459A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |