US3640944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified polyester film for punched tapes
Assignee: 3M Co
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Filing: 1969-01-31
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Granted: 1972-02-08
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Expires: 1989-01-31
Abstract
Abstract A DURABLE RELATIVELY NON-ABRASIVE FILM HAVING UTILITY AS A PROGRAM TAPE IS PREPARED BY PHYSICALLY BLENDING MAJOR AMOUNTS OF POLYETHYLENE TEREPHTHALATE WITH MINOR EFFECTIVE AMOUNTS OF HIGH MELTING POLYMERS SUCH AS POLYSULFONE OR POLY (4-METHYL, 1-PENTENE) AND A LIGHT ABSORBING MATERIAL, EXTRUDING THE BLEND AS A FILM AND THEREAFTER BIAXIALLY ORIENTING IT. THE FILM ALLOWS AS LITTLE AS 1% LIGHT TRANSMISSION AND HAS A SURFACE WHICH CAN BE WRITTEN ON WITH PENCIL OR PEN.
Inventors
- 👤 Harold J Seppala
- 👤 Gerhard Benz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:45
CPC Classifications
G; G06; G06K; G06K19/00; G06K19/02; C; C08; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |