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Patent US2737831A successfully refreshed from Google Patents.
US2737831A
Expired / Lapsed
US
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Process for making a spinneret
Assignee: Akzo Nobel UK PLC
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Filing: 1952-11-01
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Granted: 1956-03-13
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Expires: 1972-11-01
Abstract
No abstract record available.
Inventors
- 👤 Wesley L Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:48
CPC Classifications
B; B21; B21D; B21D31/00; B21D31/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A PROCESS FOR MAKING A SPINNERET COMPRISING THE STEPS OF PUNCHING A HOLE IN A METAL SHEET WITH A PUNCH HAVING CONVERGING SIDES TERMINATING IN A CYLINDRICAL EXTENSION, GRINDING OFF THE METAL BUR R PRODUCED BY THE SAID PUNCHING, AND SUBSEQUENTLY SHAPING SAID PUNCHED HOLE BY INSERTING A CONICAL PUNCH INTO THE PREVIOUSLY PUNCHED HOLE FROM THE OPPOSITE DIRECTION TO FORM A CENTRAL CONSTRICTION, AND DOUBLE OUTWARDLY DIVERGING CONICAL WALLS EXTENDING IN OPPOSITE DIRECTIONS FROM SAID CONSTRICTION.
Claim 2
Dependent Claim
77 words
A PROCESS FOR MAKING A SPINNERET COMPRISING THE STEPS OF PUNCHING A HOLE IN A METAL SHEET WITH A PUNCH HAVING CONVERGING SIDES TERMINATING IN A CYLINDRICAL EXTENSION, GRINDING OFF THE METAL BUR R PRODUCED BY THE SAID PUNCHING, AND SUBSEQUENTLY SHAPING SAID PUNCHED HOLE BY INSERTING A CONICAL PUNCH INTO THE PREVIOUSLY PUNCHED HOLE FROM THE OPPOSITE DIRECTION TO FORM A CENTRAL CONSTRICTION, AND DOUBLE OUTWARDLY DIVERGING CONICAL WALLS EXTENDING IN OPPOSITE DIRECTIONS FROM SAID CONSTRICTION.
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) | 1959-03-13 | 1959-09-12 | 1960-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-13 | 1963-09-12 | 1964-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-13 | 1967-09-12 | 1968-03-13 | $7700.00 | Window Closed / Lapsed |