Patent US3716437A successfully refreshed from Google Patents.
US3716437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Base for adhesive tapes
Assignee: Individual
•
Filing: 1970-10-12
•
Granted: 1973-02-13
•
Expires: 1990-10-12
Abstract
Abstract A base film suitable for adhesive tapes of enhanced tensile strength combined with high dielectric strength is made by selecting an extruded composite film comprising a superimposed films of different softening points, and then reinforcing the lower-softening film with an unwoven and unspun array of textilelength fibers.
Inventors
- 👤 D Satas
- 👤 N Newman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:46
CPC Classifications
C; C09; C09J; C09J7/00; C09J7/20; C09J7/29; B; B32; B32B; B32B27/00; B32B27/12; B32B27/30; B32B27/306; B32B27/32; B32B27/36; B32B2405/00; C09J2400/00; C09J2400/20; C09J2400/26; C09J2400/263; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1089; Y10T156/109; Y10T428/00; Y10T428/28; Y10T428/2848; Y10T428/31504; Y10T428/31786
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
A process for preparing a fiber-reinforced multi-component film base suitable for the manufacture of adhesive tapes which comprises extruding as a unitary sheet a plurality of polymeric films in stratified face-to-face contact, at least one of the exterior polymeric films having a lower softening temperature than at least one of the other of said films, applying to the exterior film having the lower softening point a substantially unbonded and unwoven array of intermingled textile-length fibers, and heating the assembly under pressure to force the textile-length fibers through at least 80% of the depth of the lower-softening film and to encapsulate the major portion of said fibers with the substance of said lower-softening film throughout the length and breadth of said lower softening film, while leaving the higher-softening components of the film substantially unaffected.
Claim 2
Dependent Claim
133 words
A process for preparing a fiber-reinforced multi-component film base suitable for the manufacture of adhesive tapes which comprises extruding as a unitary sheet a plurality of polymeric films in stratified face-to-face contact, at least one of the exterior polymeric films having a lower softening temperature than at least one of the other of said films, applying to the exterior film having the lower softening point a substantially unbonded and unwoven array of intermingled textile-length fibers, and heating the assembly under pressure to force the textile-length fibers through at least 80% of the depth of the lower-softening film and to encapsulate the major portion of said fibers with the substance of said lower-softening film throughout the length and breadth of said lower softening film, while leaving the higher-softening components of the film substantially unaffected.
Claim 3
Dependent Claim
23 words
The process of claim 1 in which two films are coextruded, one being at least 35*F. lower in softening point than the other.
Claim 4
Dependent Claim
23 words
The process according to claim 2 wherein one film is polypropylene and the other film is a copolymer of ethylene and vinyl acetate.
References Cited (Backward Citations)
US2539690A
Cited
US2949394A
Cited
US2882183A
Cited
US3321357A
Cited
US3275487A
Cited
US3505144A
Cited
US3622422A
Cited
US3516886A
Cited
US3532588A
Cited
US3573125A
Cited
US3589958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |