US3272902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of injection molding plastic footwear
Assignee: Individual
•
Filing: 1964-04-16
•
Granted: 1966-09-13
•
Expires: 1984-04-16
Abstract
No abstract record available.
Inventors
- 👤 Herbert P Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:59
CPC Classifications
B; B29; B29D; B29D35/00; B29D35/06; B29D35/08; B29D35/081
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
105 words
THE METHOD OF MAKING PLASTIC FOOTWEAR COMPRISING THE STEPS OF: INJECTION MOLDING AN INTEGRATED UPPER, MIDSOLE AND HEEL CORE BY INJECTING A CHARGE OF LIQUID PLASTIC INTO A FIRST MOLD ABOUT A RIGID FORM OF THE DESIRED SHAPE; COOLING THE MOLDED ARTICLE TO EFFECT SOLIDIFICATION AND SHRINKAGE; PLACING THE MOLD ARTICLE OVER A SECOND INJECTION MOLD; AND INJECTION MOLDING AN INTEGRATED OUTSOLE AND HEEL COVER TO COVER THE INSOLE AND HEEL CORE BY INJECTING A SECOND CHARGE OF LIQUID PLASTIC INTO THE SECOND MOLD TO COVER THE INSOLE AND HEEL CORE WHILE HOLDING THE INJECTED PLASTIC CONFINED BY SAID SECOND MOLD TO THE DESIRED DIMENSIONS.
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) | 1969-09-12 | 1970-03-14 | 1970-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-12 | 1974-03-14 | 1974-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-12 | 1978-03-14 | 1978-09-13 | $7700.00 | Window Closed / Lapsed |