US3194041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming corrugated tubes
Assignee: Individual
•
Filing: 1960-11-07
•
Granted: 1965-07-13
•
Expires: 1980-11-07
Abstract
No abstract record available.
Inventors
- 👤 Herbert G Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:54
CPC Classifications
B; B21; B21D; B21D15/00; B21D15/04; B21D15/10; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1016
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
THE METHOD OF FORMING TOROIDAL CORRUGATIONS ON TUBES WHEREIN THE TORIC SECTION IS CIRCULAR FOR CONSIDERABLY MORE THAN 180 DEGREES, WHICH COMPRISES: CONFINING THE TUBE EXTERIORLY AROUND ITS CIRCUMFERENCE AT SPACED POINTS ALONG ITS LENGTH BY DIE RING ELEMENTS HAVING FLAT RADIAL SIDES; APPLYING FLUID PRESSURE WITHIN THE TUBE TO FORM A BULGE BETWEEN SAID AXIALLY SPACED FLAT-FACED DIE RING ELEMENTS; FORCING THE ENDS OF SAID BULGE AXIALLY TOGETHER WHILE CONTINUING TO APPLY FLUID PRESSURE TO FORM A FLAT-SIDED CORRUGATION WITH A CROWNED PERIPHERY; REMOVING SAID FLAT-SIDED DIE RING ELEMENTS; RESTRAINING THE TUBE AT THE INNER ENDS OF SAID CORRUGATION AGAINST OUTWARD RADIAL MOVEMENT, LEAVING THE OUTER PORTION OF SAID CORRUGATION UNRESTRAINED AGAINST AXIAL EXPANSION; AND APPLYING FLUID PRESSURE WITHIN SAID CORRUGATION TO EXPAND IT INTO A TOROIDAL SHAPE WHICH IS APPROXIMATELY CIRCULAR IN SECTION OVER CONSIDERABLY MORE THAN 180 DEGREES OF ITS OUTER PERIPHERY.
Claim 2
Independent Claim
145 words
THE METHOD OF FORMING TOROIDAL CORRUGATIONS ON TUBES WHEREIN THE TORIC SECTION IS CIRCULAR FOR CONSIDERABLY MORE THAN 180 DEGREES, WHICH COMPRISES: CONFINING THE TUBE EXTERIORLY AROUND ITS CIRCUMFERENCE AT SPACED POINTS ALONG ITS LENGTH BY DIE RING ELEMENTS HAVING FLAT RADIAL SIDES; APPLYING FLUID PRESSURE WITHIN THE TUBE TO FORM A BULGE BETWEEN SAID AXIALLY SPACED FLAT-FACED DIE RING ELEMENTS; FORCING THE ENDS OF SAID BULGE AXIALLY TOGETHER WHILE CONTINUING TO APPLY FLUID PRESSURE TO FORM A FLAT-SIDED CORRUGATION WITH A CROWNED PERIPHERY; REMOVING SAID FLAT-SIDED DIE RING ELEMENTS; RESTRAINING THE TUBE AT THE INNER ENDS OF SAID CORRUGATION AGAINST OUTWARD RADIAL MOVEMENT, LEAVING THE OUTER PORTION OF SAID CORRUGATION UNRESTRAINED AGAINST AXIAL EXPANSION; AND APPLYING FLUID PRESSURE WITHIN SAID CORRUGATION TO EXPAND IT INTO A TOROIDAL SHAPE WHICH IS APPROXIMATELY CIRCULAR IN SECTION OVER CONSIDERABLY MORE THAN 180 DEGREES OF ITS OUTER PERIPHERY.
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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) | 1968-07-12 | 1969-01-11 | 1969-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-12 | 1973-01-11 | 1973-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-12 | 1977-01-11 | 1977-07-13 | $7700.00 | Window Closed / Lapsed |