US3309260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite film-fabric electrical insulating sheet
Assignee: 3M Co
•
Filing: 1960-02-19
•
Granted: 1967-03-14
•
Expires: 1980-02-19
Abstract
No abstract record available.
Inventors
- 👤 Alvin W Boese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:59
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/48; H01B3/50; H01B3/008; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T442/00; Y10T442/60; Y10T442/674; Y10T442/675; Y10T442/69
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A COMPOSITE FILM-FABRIC SHEET COMPRISING (1) A HEAT-PRESSED TISSUE-LIKE FABRIC OF HETEROGENEOUSLY INTERLACED DRAWN AND UNDRAWN STAPLE UNPLASTICIZED POLYESTER FIBERS, SAID UNDRAWN FIBERS BEING FORMED OF THE SAME POLYESTER AS SAID DRAWN FIBERS AND HAVING BEEN CONVERTED FROM AN INITIAL RELATIVELY LOW SOFTENING AMORPHOUR STATE TO A CRYSTALLINE STATE AFFORDING SUBSTANTIALLY THE SAME SOFTENING TEMPERATURE RANGE AS THAT OF THE DRAWN FIBERS, SAID CRYSALLIZED UNDRAWN FIBERS BEING AUTOGENOUSLY INTERBONDED AT THEIR CROSSING POINTS TO FORM A NETWORK WITHIN WHICH SAID DRAWN FIBERS ARE INTERLACED WITHOUT BEING INTERBONDED TO EACH OTHER, SAID FABRICHAVING A REAM WEIGHT OF ABOUT 15 TO 60 POUNDS, AND (2) A FILM OF ELECTRICAL INSULATING RESIN INSEPARABLY UNITED TO SAID FABRIC.
Claim 2
Dependent Claim
114 words
A COMPOSITE FILM-FABRIC SHEET COMPRISING (1) A HEAT-PRESSED TISSUE-LIKE FABRIC OF HETEROGENEOUSLY INTERLACED DRAWN AND UNDRAWN STAPLE UNPLASTICIZED POLYESTER FIBERS, SAID UNDRAWN FIBERS BEING FORMED OF THE SAME POLYESTER AS SAID DRAWN FIBERS AND HAVING BEEN CONVERTED FROM AN INITIAL RELATIVELY LOW SOFTENING AMORPHOUR STATE TO A CRYSTALLINE STATE AFFORDING SUBSTANTIALLY THE SAME SOFTENING TEMPERATURE RANGE AS THAT OF THE DRAWN FIBERS, SAID CRYSALLIZED UNDRAWN FIBERS BEING AUTOGENOUSLY INTERBONDED AT THEIR CROSSING POINTS TO FORM A NETWORK WITHIN WHICH SAID DRAWN FIBERS ARE INTERLACED WITHOUT BEING INTERBONDED TO EACH OTHER, SAID FABRICHAVING A REAM WEIGHT OF ABOUT 15 TO 60 POUNDS, AND (2) A FILM OF ELECTRICAL INSULATING RESIN INSEPARABLY UNITED TO SAID FABRIC.
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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) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |