US3875116A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyetherimides
Assignee: General Electric Co
•
Filing: 1974-03-08
•
Granted: 1975-04-01
•
Expires: 1994-03-08
Abstract
Abstract Polyetherimides are provided by effecting reaction between certain aromatic bis(etheranhydride) and organic diamine. The polyetherimides can be reinforced with various fillers to produce high performance composites.
Inventors
- 👤 Darrell R Heath
- 👤 Joseph G Wirth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:57
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1067; C08G73/1071; C08G73/1046; C08G73/1053; C08G73/1057; C08G73/1064
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
10 words
POLYETHERIMIDES CONSISTING ESSENTIALLY OF CHEMICALLY COMBINED UNITS OF THE FORMULA,
Claim 2
Dependent Claim
10 words
POLYETHERIMIDES CONSISTING ESSENTIALLY OF CHEMICALLY COMBINED UNITS OF THE FORMULA,
Claim 3
Dependent Claim
9 words
Polyetherimide in accordance with claim 1, where R is
References Cited (Backward Citations)
US3699075A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |