Patent US4048150A successfully refreshed from Google Patents.
US4048150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leader of a carrier of information in the form of a web
Assignee: Hoechst AG
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Filing: 1975-12-15
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Granted: 1977-09-13
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Expires: 1995-12-15
Abstract
Abstract This invention relates to a leader of an information carrier web suitable for photoelectric control, comprising a polyester film oriented by biaxial stretching, having one layer, and a transparency of at least 60 per cent when exposed to light of a wavelength of 750 nm.
Inventors
- 👤 Rolf Bergmann
- 👤 Klaus Hoheisel
- 👤 Helmut Schafer
- 👤 Manfred Unger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:54
CPC Classifications
G; G03; G03G; G03G16/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
75 words
A leader of an information carrier web suitable for photoelectric control, comprising a polyester film oriented by biaxial stretching having a greater strength in the machine direction than in the transverse direction and being internally colored with an organic dye which is sufficiently heat-resistant and which has a sufficiently low light absorption said leader having one layer and a transparency of at least 60 percent when exposed to light of a wavelength of 750 nm.
Claim 2
Dependent Claim
75 words
A leader of an information carrier web suitable for photoelectric control, comprising a polyester film oriented by biaxial stretching having a greater strength in the machine direction than in the transverse direction and being internally colored with an organic dye which is sufficiently heat-resistant and which has a sufficiently low light absorption said leader having one layer and a transparency of at least 60 percent when exposed to light of a wavelength of 750 nm.
Claim 3
Dependent Claim
40 words
A leader according to claim 1 composed of a polyester film produced by extruding a polyester raw material containing a heat-resistant organic dye having a sufficiently low light absorption, quenching the preliminary film, biaxially stretching, and finally heat-setting the film.
Claim 4
Dependent Claim
12 words
A leader according to claim 1 composed of a polyethylene terephthalate film.
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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) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |