Patent US3407638A successfully refreshed from Google Patents.
US3407638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming serrated or corrugated hollow tubes
Assignee: Kinefac Corp
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Filing: 1966-03-24
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Granted: 1968-10-29
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Expires: 1986-03-24
Abstract
No abstract record available.
Inventors
- 👤 Howard A Greis
- 👤 Vincent T Kubert
- 👤 George H Pettee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:40
CPC Classifications
B; B21; B21D; B21D15/00; B21D15/04; B21D15/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
THE PROCESS OF FORMING UNIFORM CORRUGATIONS IN A HOLLOW TUBE COMPRISING: PLACING A MANDREL HAVING TEETH THEREON WITHIN A TUBE, PROVIDING A PLURALITY OF TOOTHED DIES, THE DIE TEETH HAVING A SPACING EQUIVALENT TO THOSE ON THE MANDREL, ROTATING SAID DIES AND MANDREL TOGETHER IN PHASE RELATIONSHIP TO THAT THE DIE TEETH REGISTER WITH THE SPACES BETWEEN MANDREL TEETH, AND FORCING SAID DIES RADIALLY AGAINST THE TUBE WITH SUFFICIENT FORCE TO CAUSE THE TUBE TO DEFORM BETWEEN DIE TEETH AND MANDREL TEETH, AND
Claim 2
Dependent Claim
83 words
THE PROCESS OF FORMING UNIFORM CORRUGATIONS IN A HOLLOW TUBE COMPRISING: PLACING A MANDREL HAVING TEETH THEREON WITHIN A TUBE, PROVIDING A PLURALITY OF TOOTHED DIES, THE DIE TEETH HAVING A SPACING EQUIVALENT TO THOSE ON THE MANDREL, ROTATING SAID DIES AND MANDREL TOGETHER IN PHASE RELATIONSHIP TO THAT THE DIE TEETH REGISTER WITH THE SPACES BETWEEN MANDREL TEETH, AND FORCING SAID DIES RADIALLY AGAINST THE TUBE WITH SUFFICIENT FORCE TO CAUSE THE TUBE TO DEFORM BETWEEN DIE TEETH AND MANDREL TEETH, AND
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) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |