US2537666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Producing thick sheets from thin films
Assignee: Dow Chemical Co
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Filing: 1945-08-10
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Granted: 1951-01-09
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Expires: 1965-08-10
Abstract
No abstract record available.
Inventors
- 👤 James S Gowing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:38
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/08; B; B29; B29C; B29C65/00; B29C65/02; B29C65/04; B29C65/82; B29C65/8207; B29C65/8215; B29C66/00; B29C66/01; B29C66/03; B29C66/034; B29C66/0342; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/342; B29C66/40; B29C66/41; B29C66/45; B29C66/70; B29C66/71; B29C66/73; B29C66/735; B29C66/7352; B29C66/737; B29C66/7371; B29C66/73711; B29C66/7377; B29C66/73775; B29C66/73776; B29C66/739; B29C66/7392; B29C66/73921; B29C66/90; B29C66/91; B29C66/914; B29C66/9141; B29C66/91411; B29C66/919; B29C66/9192; B29C66/91921; B29C66/91931; B29C66/91935; B29C66/92; B29C66/929; B29C66/94; B29C66/949; B29C65/18; B29C66/73771; B29C66/73772; B29C66/80; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/83413
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
THE METHOD WHICH CONSISTS IN STACKING AT LEAST TWO THIN FILMS OF STRETCHED AND ORIENTED CRYSTALLINE VINYLIDENE CHLORIDE COPOLYMER, THE AGGREGATE THICKNESS OF WHICH IS FROM 0.0025 TO ABOUT 0.1 INCH, REMOVING AIR FROM BETWEEN THE FILMS, SECURING ALL EDGES OF THE ASSEMBLY AGAINST SHRINKAGE, HEATING THE ASSEMBLY SUBSTANTIALLY AT ATMOSPHERIC PRESSURE AT A TEMPERATURE FROM 20 TO 45 CENTIGRADE DEGREES BELOW THE FUSION TEMPERATURE UNTIL IT IS HEATED THROUGHOUT, AND COOLING THE ASSEMBLY TO ROOM TEMPERATURE, THEREBY TO PRODUCE AN APPARENTLY UNITARY, COHERENT SHEET OF THICKNESS SUBSTANTIALLY EQUAL TO THE SUM OF THE THICKNESSES OF THE INITIAL THIN FILMS.
Claim 2
Independent Claim
100 words
THE METHOD WHICH CONSISTS IN STACKING AT LEAST TWO THIN FILMS OF STRETCHED AND ORIENTED CRYSTALLINE VINYLIDENE CHLORIDE COPOLYMER, THE AGGREGATE THICKNESS OF WHICH IS FROM 0.0025 TO ABOUT 0.1 INCH, REMOVING AIR FROM BETWEEN THE FILMS, SECURING ALL EDGES OF THE ASSEMBLY AGAINST SHRINKAGE, HEATING THE ASSEMBLY SUBSTANTIALLY AT ATMOSPHERIC PRESSURE AT A TEMPERATURE FROM 20 TO 45 CENTIGRADE DEGREES BELOW THE FUSION TEMPERATURE UNTIL IT IS HEATED THROUGHOUT, AND COOLING THE ASSEMBLY TO ROOM TEMPERATURE, THEREBY TO PRODUCE AN APPARENTLY UNITARY, COHERENT SHEET OF THICKNESS SUBSTANTIALLY EQUAL TO THE SUM OF THE THICKNESSES OF THE INITIAL THIN FILMS.
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) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |