US3339006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of thermoforming foamed plastic articles
Assignee: WR Grace and Co
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Filing: 1964-07-08
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Granted: 1967-08-29
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Expires: 1984-07-08
Abstract
No abstract record available.
Inventors
- 👤 Frederick H Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:28
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/02; B29B; B29B13/00; B29B13/02; B29B13/023; B29C44/00; B29C44/34; B29C44/56; B29C44/5627; B29C44/5636; B29C61/00; B29C61/02; B29C51/08; B29C51/082; B29K; B29K2025/00; B29K2105/00; B29K2105/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
IN THE METHOD OF FORMING ARTICLES FROM A SHEET OF THERMOPLASTIC FOAM BY HEATING SAID SHEET TO RENDER IT DEFORMABLE, THEN DEFORMING THE HEATED SHEET INTO SAID ARTICLE AND COOLING IT TO SET IT; THAT IMPROVEMENT IN THE HEATING STEP COMPRISING PERMITTING SAID SHEET TO SHRINK LATERALLY DURING HEATING WHILE RESTRAINING SAID SHEET FROM CURLING INWARDLY AND PERMITTED SAID SHEET TO SHRINK LONGITUDINALLY.
Claim 2
Dependent Claim
63 words
IN THE METHOD OF FORMING ARTICLES FROM A SHEET OF THERMOPLASTIC FOAM BY HEATING SAID SHEET TO RENDER IT DEFORMABLE, THEN DEFORMING THE HEATED SHEET INTO SAID ARTICLE AND COOLING IT TO SET IT; THAT IMPROVEMENT IN THE HEATING STEP COMPRISING PERMITTING SAID SHEET TO SHRINK LATERALLY DURING HEATING WHILE RESTRAINING SAID SHEET FROM CURLING INWARDLY AND PERMITTED SAID SHEET TO SHRINK LONGITUDINALLY.
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) | 1970-08-28 | 1971-02-27 | 1971-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-28 | 1975-02-27 | 1975-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-28 | 1979-02-27 | 1979-08-29 | $7700.00 | Window Closed / Lapsed |