Patent US4721592A successfully refreshed from Google Patents.
US4721592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film embossing process
Assignee: EIDP Inc
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Filing: 1987-01-23
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Granted: 1988-01-26
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Expires: 2007-01-23
Abstract
Abstract Two or more sheets of polyvinyl fluoride film fuse together without the use of adhesive or embossing resin when passed through a hot roll embossing machine. The pressures, temperatures and feed rate are critical and depend on film thickness and the depth and type of pattern used.
Inventors
- 👤 Vernon P. Fruehauf
- 👤 Albert H. Hoefling
- 👤 William S. Schlegel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:46
CPC Classifications
B; B32; B32B; B32B38/00; B32B38/06; B29; B29C; B29C59/00; B29C59/02; B29C59/04; B29C59/046; B32B37/00; B29K; B29K2027/00; B29K2027/12; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1023
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
105 words
A process for embossing and fusing two layers of polyvinyl fluoride films without adhesive comprising: passing two separate sheets of such film, each being about 0.002 to about 0.004 inch thick between the nip of a heated embossing roll and a backup roll at a speed of about 1 to 1.5 yards per minute, maintaining a pressure between the rolls of from about 400 to 430 lbs per linear inch of film width, maintaining the temperature of the embossing roll in the range of from 360°-390° F. while maintaining the temperature of the backup roll below 170° F. and then cooling and winding said film.
Claim 2
Dependent Claim
105 words
A process for embossing and fusing two layers of polyvinyl fluoride films without adhesive comprising: passing two separate sheets of such film, each being about 0.002 to about 0.004 inch thick between the nip of a heated embossing roll and a backup roll at a speed of about 1 to 1.5 yards per minute, maintaining a pressure between the rolls of from about 400 to 430 lbs per linear inch of film width, maintaining the temperature of the embossing roll in the range of from 360°-390° F. while maintaining the temperature of the backup roll below 170° F. and then cooling and winding said film.
Claim 3
Dependent Claim
105 words
A process for embossing and fusing three layers of polyvinyl fluoride films without adhesive comprising: passing three separate sheets of such film, each being about 0.0005 to about 0.004 inch thick between the nip of a heated embossing roll and a backup roll at a speed of about 0.75 to 1.5 yards per minute, maintaining a pressure between the rolls of from about 400 to 430 lbs per linear inch of film width, maintaining the temperature of the embossing roll in the range of from 360°-390° F. while maintaining the temperature of the backup roll below 170° F. and then cooling and winding said film.
Claim 4
Dependent Claim
105 words
A process for embossing and fusing three layers of polyvinyl fluoride films without adhesive comprising: passing three separate sheets of such film, each being about 0.0005 to about 0.004 inch thick between the nip of a heated embossing roll and a backup roll at a speed of about 0.75 to 1.5 yards per minute, maintaining a pressure between the rolls of from about 400 to 430 lbs per linear inch of film width, maintaining the temperature of the embossing roll in the range of from 360°-390° F. while maintaining the temperature of the backup roll below 170° F. and then cooling and winding said film.
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) | 1991-01-25 | 1991-07-27 | 1992-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-25 | 1995-07-27 | 1996-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-25 | 1999-07-27 | 2000-01-26 | $7700.00 | Window Closed / Lapsed |