Patent US3396837A successfully refreshed from Google Patents.
US3396837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-sensitive adhesive masking tape having polypropylene film backing
Assignee: 3M Co
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Filing: 1964-03-16
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Granted: 1968-08-13
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Expires: 1984-03-16
Abstract
No abstract record available.
Inventors
- 👤 Ambrose F Schmelzle
- 👤 Charlotte I Sauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:08
CPC Classifications
C; C09; C09J; C09J7/00; C09J7/20; C09J7/22; C09J7/24; C09J7/241; C09J7/243; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/266; Y10T428/28; Y10T428/2852; Y10T428/2874; Y10T428/2878
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A NONFIBROUS FINGER-TEARABLE STRETCHABLE PRESSURESENSITIVE ADHESIVE TAPE HAVING AN UNPLASTICIZED UNORIENTED POLYPROPYLENE FILM BACKING COATED WITH AN AGGRESSIVELY-TACKY PRESSURE-SENSITIVE ADHESIVE, WHEREIN SAID FILM BACKING HAS A THICKNESS OF APPROXIMATELY 3 TO 4 MILS AND CONSISTS ESSENTIALLY OF PIGMENTED ISOTACTIC POLYPROPYLENE WHICH HAS A MELT FLOW VALUE IN THE RANGE OF 1 TO 10, CONTAINING APPROXIMATELY 2 TO 20% TOTAL DISPERSED PIGMENT WHICH OPACIFIES THE FILM HAVING BEEN COMPOUNDED AND MELT-FORMED IN SUCH MANNER THAT IT IS READILY FINGERTEARABLE, HAS AN ELONGATION AT BREAK OF OVER 100% AND A TENSILE STRENGTH OF AT LEAST 10 POUNDS PER INCH WIDTH AT A 500% PER MINUTES STRAIN RATE, AND AN ELONGATION AT BREAK IN THE RANGE OF 10 TO 50% AT A 5000% PER MINUTE STRAIN RATE.
Claim 2
Dependent Claim
124 words
A NONFIBROUS FINGER-TEARABLE STRETCHABLE PRESSURESENSITIVE ADHESIVE TAPE HAVING AN UNPLASTICIZED UNORIENTED POLYPROPYLENE FILM BACKING COATED WITH AN AGGRESSIVELY-TACKY PRESSURE-SENSITIVE ADHESIVE, WHEREIN SAID FILM BACKING HAS A THICKNESS OF APPROXIMATELY 3 TO 4 MILS AND CONSISTS ESSENTIALLY OF PIGMENTED ISOTACTIC POLYPROPYLENE WHICH HAS A MELT FLOW VALUE IN THE RANGE OF 1 TO 10, CONTAINING APPROXIMATELY 2 TO 20% TOTAL DISPERSED PIGMENT WHICH OPACIFIES THE FILM HAVING BEEN COMPOUNDED AND MELT-FORMED IN SUCH MANNER THAT IT IS READILY FINGERTEARABLE, HAS AN ELONGATION AT BREAK OF OVER 100% AND A TENSILE STRENGTH OF AT LEAST 10 POUNDS PER INCH WIDTH AT A 500% PER MINUTES STRAIN RATE, AND AN ELONGATION AT BREAK IN THE RANGE OF 10 TO 50% AT A 5000% PER MINUTE STRAIN RATE.
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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) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |