US4661604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monofunctional crosslinking imidophenols
Assignee: Boeing Co
•
Filing: 1983-08-12
•
Granted: 1987-04-28
•
Expires: 2003-08-12
Abstract
Abstract Resins are prepared from polysulfone and polyethersulfone polymers that bear functional groups derived from compounds that are condensation products of amino-phenols and acid anhydrides. The polymers are prepared by coreacting aromatic compounds holding two hydroxyl groups, aromatic compounds holding two active halogen groups, and the condensation product of amino-phenol and acid anhydride, the condensation product holding one hydroxyl group. The resulting product has a molecular weight between about 1,000 and 40,000, preferably between about 5,000 and 30,000, and can be cross-linked to form a resin that is thermoplastic and solvent resistant.
Inventors
- 👤 Hyman R. Lubowitz
- 👤 Clyde H. Sheppard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:11
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/44; C07D207/444; C07D207/448; C07D207/452; C07D209/00; C07D209/56; C07D209/80; C07D209/94; C08; C08G; C08G75/00; C08G75/20; C08G75/23; C08J; C08J5/00; C08J5/24; C08J5/241; C08J5/243; C08J2381/00; C08J2381/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
21 words
A compound having the formula: ##STR40## wherein X is selected from the group consisting of ##STR41## and R" is lower alkyl.
Claim 2
Dependent Claim
21 words
A compound having the formula: ##STR40## wherein X is selected from the group consisting of ##STR41## and R" is lower alkyl.
Claim 3
Dependent Claim
10 words
A compound according to claim 1, wherein X is ##STR42##
Claim 4
Dependent Claim
10 words
A compound according to claim 1, wherein X is ##STR43##
Claim 5
Dependent Claim
10 words
A compound according to claim 1, wherein X is ##STR44##
References Cited (Backward Citations)
US3236808A
Cited
US3265708A
Cited
US4108837A
Cited
US4175175A
Cited
US3355272A
Cited
US3262914A
Cited
US3454673A
Cited
US3749735A
Cited
US3453236A
Cited
US3530087A
Cited
US3563951A
Cited
US3803081A
Cited
USRE29316E
Cited
JPS459393Y1
Cited
US3562232A
Cited
US3812159A
Cited
US3536670A
Cited
US3652710A
Cited
US3729446A
Cited
US3770697A
Cited
US3641207A
Cited
US3549231A
Cited
US3663507A
Cited
US3631222A
Cited
US3988374A
Cited
US3699075A
Cited
US3658938A
Cited
US3972902A
Cited
US3970714A
Cited
US3773718A
Cited
US3839287A
Cited
US3708439A
Cited
US3787363A
Cited
US3761441A
Cited
US3763101A
Cited
US3859252A
Cited
US3956320A
Cited
JPS49120993A
Cited
US3957862A
Cited
US3998786A
Cited
US3897395A
Cited
US4060515A
Cited
US4058505A
Cited
US4026871A
Cited
US3879349A
Cited
US3897393A
Cited
US3993630A
Cited
US3941746A
Cited
US3896147A
Cited
US3920768A
Cited
US4000146A
Cited
US4100137A
Cited
US3935167A
Cited
US4064289A
Cited
US4107153A
Cited
US4101488A
Cited
US4197397A
Cited
US4100138A
Cited
US3975862A
Cited
US4189560A
Cited
US4239883A
Cited
US4020069A
Cited
US4005134A
Cited
US4288607A
Cited
US4115231A
Cited
US4126619A
Cited
US4183839A
Cited
US4116937A
Cited
US4128574A
Cited
US4108926A
Cited
US4097456A
Cited
GB2002378A
Cited
US4297472A
Cited
US4179551A
Cited
US4269961A
Cited
US4166168A
Cited
US4168366A
Cited
US4218555A
Cited
US4176223A
Cited
US4273916A
Cited
US4206106A
Cited
US4251419A
Cited
US4255313A
Cited
US4251420A
Cited
US4251417A
Cited
US4251418A
Cited
US4299750A
Cited
US4298720A
Cited
US4276407A
Cited
US4398821A
Cited
US4375427A
Cited
US4293670A
Cited
US4297474A
Cited
US4386848A
Cited
US4405770A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |