US3393546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control device for spiral pipe forming machine
Assignee: FAY PIPE AND PILE CO Inc
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Filing: 1966-02-24
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Granted: 1968-07-23
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Expires: 1986-02-24
Abstract
No abstract record available.
Inventors
- 👤 James E Fay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:22
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
IN AN APPARATUS FOR MANUFACTURING SPIRAL PIPE HAVING A FRAME AND FORMING ELEMENTS MOUNTED ON SAID FRAME FOR CONTINUOUSLY FORMING A SHEET MATERIAL INTO A SPIRAL LOOP, THE IMPROVEMENT COMPRISING AN ELONGATED MEASURING AND RESTRAINING ELEMENT POSITIONED AROUND AND IN CONTACTING ENGAGEMENT WITH A PORTION OF SAID LOOP, MOUNTING MEANS FOR MOUNTING SAID ELEMENT ON THE FRAME TO PREVENT TRANSVERSE MOVEMENT OF SAID ELEMENT AS THE SPIRAL LOOP MOVES THROUGH THE FORMING APPARATUS AND MEASURING MEANS FOR MEASURING THE VARIATIONS IN TENSION IN SAID ELEMENT CAUSED BY VARIATIONS IN THE LOOP CIRCUMFERENCE AND CONFIGURATION DURING ITS MOVEMENT.
Claim 2
Dependent Claim
97 words
IN AN APPARATUS FOR MANUFACTURING SPIRAL PIPE HAVING A FRAME AND FORMING ELEMENTS MOUNTED ON SAID FRAME FOR CONTINUOUSLY FORMING A SHEET MATERIAL INTO A SPIRAL LOOP, THE IMPROVEMENT COMPRISING AN ELONGATED MEASURING AND RESTRAINING ELEMENT POSITIONED AROUND AND IN CONTACTING ENGAGEMENT WITH A PORTION OF SAID LOOP, MOUNTING MEANS FOR MOUNTING SAID ELEMENT ON THE FRAME TO PREVENT TRANSVERSE MOVEMENT OF SAID ELEMENT AS THE SPIRAL LOOP MOVES THROUGH THE FORMING APPARATUS AND MEASURING MEANS FOR MEASURING THE VARIATIONS IN TENSION IN SAID ELEMENT CAUSED BY VARIATIONS IN THE LOOP CIRCUMFERENCE AND CONFIGURATION DURING ITS MOVEMENT.
References Cited (Backward Citations)
US1939581A
Cited
US3256724A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-23 | 1972-01-22 | 1972-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-23 | 1976-01-22 | 1976-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-23 | 1980-01-22 | 1980-07-23 | $7700.00 | Window Closed / Lapsed |