US3740305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite materials bonded with siloxane containing polyimides
Assignee: Von Roll Isola USA Inc
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Filing: 1971-10-01
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Granted: 1973-06-19
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Expires: 1991-10-01
Abstract
Abstract COMPOSITE MATERIALS ARE PREPARED BY TREATING MATERIALS WITH A SILOXANE CONTAINING POLYAMIC ACID BLOCK COPOLYMERS AND THEREAFTER CONVERTING THE POLYAMIC ACID BLOCK COPOLYPOLYIMIDE STATE. THE POLYAMIC ACID BLOCK COPOLYMERS ARE OBTAINED FROM THE REACTION OF AN ORGANIC DIAMINE, AN ORGANIC TETRACARBOXYLIC DIANHYDRIDE, AND A POLYSILOXANE DIAMINE IN A SUITABLE ORGANIC SOLVENT.
Inventors
- 👤 J Hoback
- 👤 F Holub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:36
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/02; B32B17/04; B32B7/00; B32B7/04; B32B7/12; B32B27/00; B32B27/06; B32B27/08; B32B27/28; B32B27/281; B32B27/34; B32B27/36; B32B27/365; B32B5/00; B32B5/22; B32B5/24; B32B5/26; C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1057; C08G73/106; C08G77/00; C08G77/42; C08G77/452; C08G77/455; C09; C09J; C09J183/00; C09J183/10; B32B2262/00; B32B2262/10; B32B2262/101; B32B2262/106; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31609; Y10T428/31612; Y10T428/31623; Y10T428/31652; Y10T428/31663; Y10T428/31678; Y10T428/31681; Y10T442/00; Y10T442/30; Y10T442/3472; Y10T442/3602; Y10T442/3667; Y10T442/3683; Y10T442/3691
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |