US3222437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for simultaneously molding and expanding stereoregular polypropylene to form a hinge
Assignee: Hercules Powder Co
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Filing: 1962-06-18
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Granted: 1965-12-07
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Expires: 1982-06-18
Abstract
No abstract record available.
Inventors
- 👤 William M Schilling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:37
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/02; B29C53/04; B29C53/06; B29C53/063; B29C53/066; B29C44/00; B29C44/02; B29C44/10; B29C44/34; B29C44/56; B29C59/00; B29K; B29K2023/00; B29K2023/10; B29K2023/12; B29K2105/00; B29K2105/25; B29K2105/253; B29K2105/256; B29L; B29L2031/00; B29L2031/22; Y; Y10; Y10S; Y10S16/00; Y10S16/13; Y10S264/00; Y10S264/16; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1026; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24496; Y10T428/24504
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A PROCESS FOR SIMULTANEOUSLY MOLDING AND EXPANDING STEREOREGULAR POLYPROPYLENE TO PRODUCE AN ARTICLE OF MANUFACTURE COMPRISING TWO BODY PORTINS OF EXPANDED STEREOREGULAR POLYPROPYLENE OF SUBSTANTIALLY UNIFORM THICKNESS JOINED BY AN INTEGRALLY MOLDED HINGE OF SUBSTANTIALLY UNEXPANDED STEREOREGULAR POLYPROPYLENE WHICH COMPRISES HEATING IN A MOLD A SHEET OF UNEXPANDED STEREOREGULAR POLYPROPYLENE HAVING A BLOWING AGENT ADMIXED THEREWITH AND CAUSING THE MAJOR PORTIONS OF SAID SHEET TO EXPAND TO A UNIFORM THICKNESS WHILE RESTRAINING A STRAIGHT AND RELATIVELY NARROW SECTION OF SAID SHEET FROM EXPANDING BY CONTACTING DURING THE PERIOD WHEN EXPANSION IS BEING EFFECTED, AT LEAST ONE SURFACE OF THE AREA WHICH IS TO SERVE AS THE AFORESAID STRAIGHT AND NARROW SECTION WITH AN ELONGATED SUBSTANTIALLY V-SHAPED MEMBER WITHIN THE MOLD.
Claim 2
Dependent Claim
120 words
A PROCESS FOR SIMULTANEOUSLY MOLDING AND EXPANDING STEREOREGULAR POLYPROPYLENE TO PRODUCE AN ARTICLE OF MANUFACTURE COMPRISING TWO BODY PORTINS OF EXPANDED STEREOREGULAR POLYPROPYLENE OF SUBSTANTIALLY UNIFORM THICKNESS JOINED BY AN INTEGRALLY MOLDED HINGE OF SUBSTANTIALLY UNEXPANDED STEREOREGULAR POLYPROPYLENE WHICH COMPRISES HEATING IN A MOLD A SHEET OF UNEXPANDED STEREOREGULAR POLYPROPYLENE HAVING A BLOWING AGENT ADMIXED THEREWITH AND CAUSING THE MAJOR PORTIONS OF SAID SHEET TO EXPAND TO A UNIFORM THICKNESS WHILE RESTRAINING A STRAIGHT AND RELATIVELY NARROW SECTION OF SAID SHEET FROM EXPANDING BY CONTACTING DURING THE PERIOD WHEN EXPANSION IS BEING EFFECTED, AT LEAST ONE SURFACE OF THE AREA WHICH IS TO SERVE AS THE AFORESAID STRAIGHT AND NARROW SECTION WITH AN ELONGATED SUBSTANTIALLY V-SHAPED MEMBER WITHIN THE MOLD.
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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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |