Patent US3346686A successfully refreshed from Google Patents.
US3346686A
Expired / Lapsed
US
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Method of uniting foamed plastic sheets and thermoforming the same
Assignee: WR Grace and Co
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Filing: 1964-05-27
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Granted: 1967-10-10
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Expires: 1984-05-27
Abstract
No abstract record available.
Inventors
- 👤 Frederick H Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:09
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/40; B29C66/41; B29C66/45; B29C44/00; B29C44/20; B29C44/22; B29C44/24; B29C44/34; B29C44/56; B29C44/5627; B29C51/00; B29C51/02; B29C51/14; B29C65/00; B29C65/02; B29C65/14; B29C65/1429; B29C65/1432; B29C65/1445; B29C65/1464; B29C65/1467; B29C65/78; B29C65/7858; B29C65/7888; B29C65/7891; B29C65/7894; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/70; B29C66/71; B29C66/72; B29C66/727; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/83413; B29C66/90; B29C66/91; B29C66/914; B29C66/9141; B29C66/91411; B29C66/91441; B29C66/91443; B29C66/91445; B29C66/919; B29C66/9192; B29C66/91921; B29C66/91931; B29C69/00; B29C65/1403; B29C65/1412; B29C65/7861; B29C65/787; B29C65/7873; B29K; B29K2105/00; B29K2105/04; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249981
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A METHOD OF MAKING ARTICLES FROM THERMOPLASTIC FOAM SHEETS COMPRISING THE STEPS OF: (A) PROVIDING TWO SEPARATE THERMOPLASTIC FOAM SHEET PLIES, EACH PLY HAVING APPROXIMATELY THE SAME THICKNESS; (B) HEATING ONE SURFACE OF EACH OF SAID PLIES TO A TEMPERATURE BELOW THAT AT WHICH SAID THERMOPLASTIC FOAM UNDERGOES CELLULAR COLLAPSE BUT AT LEAST TO A TEMPERATURE AT WHICH SAID POLIES CAN BE BONDED TOGETHER; (C) PRESSING THE TWO HEATED SURFACES OF SAID PLIES TOGETHER TO BOND SAME INTO A COMPOSITE TWO PLY SHEET;
Claim 2
Independent Claim
83 words
A METHOD OF MAKING ARTICLES FROM THERMOPLASTIC FOAM SHEETS COMPRISING THE STEPS OF: (A) PROVIDING TWO SEPARATE THERMOPLASTIC FOAM SHEET PLIES, EACH PLY HAVING APPROXIMATELY THE SAME THICKNESS; (B) HEATING ONE SURFACE OF EACH OF SAID PLIES TO A TEMPERATURE BELOW THAT AT WHICH SAID THERMOPLASTIC FOAM UNDERGOES CELLULAR COLLAPSE BUT AT LEAST TO A TEMPERATURE AT WHICH SAID POLIES CAN BE BONDED TOGETHER; (C) PRESSING THE TWO HEATED SURFACES OF SAID PLIES TOGETHER TO BOND SAME INTO A COMPOSITE TWO PLY SHEET;
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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) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |