US4549006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamideimides produced from either lactams or polyamides with isocyanates and anhydrides as thermoplasts
Assignee: Bayer AG
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Filing: 1984-08-27
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Granted: 1985-10-22
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Expires: 2004-08-27
Abstract
Abstract This invention relates to the use of polyamide imides as thermoplasts.
Inventors
- 👤 Wilfried Zecher
- 👤 Rolf Dhein
- 👤 Klaus Reinking
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:53
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/60; C08G18/603; C08G18/2805; C08G18/285; C08G18/2855; C08G18/30; C08G18/34; C08G18/343; C08G73/00; C08G73/06; C08G73/10; C08G73/14; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H01B3/306
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A thermoplastic moulding composition containing a polyamide imide produced in a first stage by reacting polyisocyanates with polycarboxylic acid anhydrides and lactams or polyamides in a solvent and then in a second stage concentrated in an evaporation extruder at a temperature of from 250° to 400° C. and condensed out.
Claim 2
Dependent Claim
50 words
A thermoplastic moulding composition containing a polyamide imide produced in a first stage by reacting polyisocyanates with polycarboxylic acid anhydrides and lactams or polyamides in a solvent and then in a second stage concentrated in an evaporation extruder at a temperature of from 250° to 400° C. and condensed out.
References Cited (Backward Citations)
US3658773A
Cited
US3752791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |