US3387067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low density plastic foam article and production technique
Assignee: Standard Oil Co
•
Filing: 1965-05-20
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Granted: 1968-06-04
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Expires: 1985-05-20
Abstract
No abstract record available.
Inventors
- 👤 Mccurdy John Lloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:56
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A METHOD OF MAKING A SOLID MASS OF UNIFORM LOW DENSITY FOAM WHICH COMPRISES HEATING A PLURALITY OF HOLLOW, THIN-WALLED ELEMENTS MADE OF A THERMOPLASTIC CONTAINING IN THE THERMOPLASTIC A VIOLATILE EXPANDING AGENT HAVING A BOILING POINT LOWER THAN THE SOFTENING POINT OF THE THERMOPLASTIC, TO A TEMPERATURE ABOVE THE SOFENING POINT OF THE THERMOPLASTIC, SO AS TO INCOMPLETELY EXPAND THE ELEMENTS, BOTH OUTWARDLY AND INWARDLY FROM THEIR WALLS, INTO INDIVIDUAL FOAM MASSES AND THEREAFTER COLLECTIIVELY FURTHER EXPANDING AND COALESCING WITHIN A CONFINING MEANS, BY FURTHER APPLICATION OF HEAT, SAID INDIVIDUAL MASSES INTO AN INTEGRAL MASS OF FOAM SAID THIN WALLS BEING OF SUFFICIENT DIMENSION SO AS TO COMPLETELY FILL, UPON EXPANSION, SAID ELEMENTS AND SAID CONFINING MEANS.
Claim 2
Independent Claim
118 words
A METHOD OF MAKING A SOLID MASS OF UNIFORM LOW DENSITY FOAM WHICH COMPRISES HEATING A PLURALITY OF HOLLOW, THIN-WALLED ELEMENTS MADE OF A THERMOPLASTIC CONTAINING IN THE THERMOPLASTIC A VIOLATILE EXPANDING AGENT HAVING A BOILING POINT LOWER THAN THE SOFTENING POINT OF THE THERMOPLASTIC, TO A TEMPERATURE ABOVE THE SOFENING POINT OF THE THERMOPLASTIC, SO AS TO INCOMPLETELY EXPAND THE ELEMENTS, BOTH OUTWARDLY AND INWARDLY FROM THEIR WALLS, INTO INDIVIDUAL FOAM MASSES AND THEREAFTER COLLECTIIVELY FURTHER EXPANDING AND COALESCING WITHIN A CONFINING MEANS, BY FURTHER APPLICATION OF HEAT, SAID INDIVIDUAL MASSES INTO AN INTEGRAL MASS OF FOAM SAID THIN WALLS BEING OF SUFFICIENT DIMENSION SO AS TO COMPLETELY FILL, UPON EXPANSION, SAID ELEMENTS AND SAID CONFINING MEANS.
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) | 1971-06-04 | 1971-12-04 | 1972-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-04 | 1975-12-04 | 1976-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-04 | 1979-12-04 | 1980-06-04 | $7700.00 | Window Closed / Lapsed |