US3284553A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin walled plastic articles and forming same
Assignee: Illinois Tool Works Inc
•
Filing: 1963-06-04
•
Granted: 1966-11-08
•
Expires: 1983-06-04
Abstract
No abstract record available.
Inventors
- 👤 Edwards Bryant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:30
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/26; B29C51/30; B29C51/34; B29C51/42; B29C51/427
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
93 words
A METHOD OF FORMING UNDERCUTS IN ARTICLES MADE FROM SHEET STOCK PLASTIC MATERIAL COMPRISING, HEATING AT LEAST A PORTION OF THE PLASTIC MATERIAL TO AFFORD READY STRETCHING THEREOF, FREEZING AT LEAST A PORTION OF THE PLASTIC MATERIAL IN AN AREA ADJACENT TO THE HEATED MATERIAL PORTION BELOW THE TEMPERATURE AFFORDING READY STRETCHING THEREOF, AND MOVING AT LEAST PART OF THE HEATED MATERIAL PORTION TO ONE SIDE OF THE FROZEN MATERIAL PORTION WHILE SUPPORTING AN AREA OF SAID FROZEN MATERIAL PORTION WITHIN THE OUTER PERIPHERAL PORTIONS THEREOF TO PROVIDE AN UNDERCUT ON AN ARTICLE.
References Cited (Backward Citations)
CA688886A
Cited
US1972789A
Cited
US2348905A
Cited
US2484656A
Cited
US2550062A
Cited
US3004288A
Cited
US3050773A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |