US4242437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitized polyamic acids curable by exposure to actinic radiation
Assignee: 3M Co
•
Filing: 1979-05-11
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Granted: 1980-12-30
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Expires: 1999-05-11
Abstract
Abstract A photosensitized polyamic acid film comprising polyamic acid and a photoinitiator, which is curable to a polyimide upon exposure to actinic radiation in the absence of externally applied heat.
Inventors
- 👤 Robert R. Rohloff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:42
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/038; G03F7/0387; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/107
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
32 words
A light sensitive article comprising a film of polyamic acid containing at least one photoinitiator therein capable of aiding in the cure of said polyamic acid upon exposure thereof to actinic radiation.
Claim 2
Dependent Claim
32 words
A light sensitive article comprising a film of polyamic acid containing at least one photoinitiator therein capable of aiding in the cure of said polyamic acid upon exposure thereof to actinic radiation.
Claim 3
Dependent Claim
40 words
A light sensitive article comprising a substrate having coated on at least one surface thereof a polyamic acid containing at least one photoinitiator therein capable of aiding in the cure of said polyamic acid upon exposure thereof to actinic radiation.
Claim 4
Dependent Claim
40 words
A light sensitive article comprising a substrate having coated on at least one surface thereof a polyamic acid containing at least one photoinitiator therein capable of aiding in the cure of said polyamic acid upon exposure thereof to actinic radiation.
References Cited (Backward Citations)
US3242136A
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US3316211A
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US3542735A
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US3573132A
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US3595971A
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US4043978A
Cited
US4055543A
Cited
US4115231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |