Patent US2507300A successfully refreshed from Google Patents.
US2507300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of glass and other thermoplastic tubes
Assignee: Individual
•
Filing: 1948-11-17
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Granted: 1950-05-09
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Expires: 1968-11-17
Abstract
No abstract record available.
Inventors
- 👤 Everett Samuel James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:00
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/04; C03B23/049; C03B23/0496
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A METHOD OF PRODUCING A THERMOPLASTIC TUBE HAVING AN ACCURATELY FINISHED BORE, COMPRISING INSERTING A MANDREL INTO A LENGTH OF OPEN ENDED TUBING, SAID MANDREL BEING OF A MATERIAL HAVING A COEFFICIENT OF THERMAL EXPANSION HIGH RELATIVELY TO THAT OF SAID TUBING AND HAVING AN EXTERNAL DIAMETER SLIGHTLY LESS THAN THE INTERNAL DIAMETER OF SAID TUBING, CONCURRENTLY HEATING SAID TUBING AND SAID MANDREL TO THE SOFTENING POINT OF SAID TUBING AND UNTIL SAID MANDREL EXPANDS INTO CONTACT WITH THE INTERIOR WALL OF SAID TUBING, STRETCHING SAID TUBING BY CONTINUING SAID CONCURRENT HEATING UNTIL SAID MANDREL EXXPANDS TO AN EXTERNAL DIAMETER GREATER THAN THE INTERNAL DIAMETER OF SAID TUBING, AND COOLING SAID TUBING AND SAID MANDREL TO FREE SAID TUBING FROM SAID MANDREL.
Claim 2
Independent Claim
122 words
A METHOD OF PRODUCING A THERMOPLASTIC TUBE HAVING AN ACCURATELY FINISHED BORE, COMPRISING INSERTING A MANDREL INTO A LENGTH OF OPEN ENDED TUBING, SAID MANDREL BEING OF A MATERIAL HAVING A COEFFICIENT OF THERMAL EXPANSION HIGH RELATIVELY TO THAT OF SAID TUBING AND HAVING AN EXTERNAL DIAMETER SLIGHTLY LESS THAN THE INTERNAL DIAMETER OF SAID TUBING, CONCURRENTLY HEATING SAID TUBING AND SAID MANDREL TO THE SOFTENING POINT OF SAID TUBING AND UNTIL SAID MANDREL EXPANDS INTO CONTACT WITH THE INTERIOR WALL OF SAID TUBING, STRETCHING SAID TUBING BY CONTINUING SAID CONCURRENT HEATING UNTIL SAID MANDREL EXXPANDS TO AN EXTERNAL DIAMETER GREATER THAN THE INTERNAL DIAMETER OF SAID TUBING, AND COOLING SAID TUBING AND SAID MANDREL TO FREE SAID TUBING FROM SAID MANDREL.
References Cited (Backward Citations)
US1999525A
Cited
US2215041A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-08 | 1953-11-07 | 1954-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-08 | 1957-11-07 | 1958-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-08 | 1961-11-07 | 1962-05-09 | $7700.00 | Window Closed / Lapsed |