US3635843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystalline 1,5-diglycidylnaphthalene and cured products thereof
Assignee: Shell USA Inc
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Filing: 1969-07-17
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Granted: 1972-01-18
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Expires: 1989-07-17
Abstract
Abstract The preparation of crystalline 1,5-diglycidylnaphthalene is described. The present invention is further directed to curable and cured compositions of 1,5-diglycidylnaphthalene.
Inventors
- 👤 Harvey L Parry
- 👤 Alton J Landua
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:11
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/24; C08G59/245; C07; C07D; C07D303/00; C07D303/02; C07D303/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
18 words
A composition as in claim 1 wherein the epoxy curing agent is employed in an approximately stoichiometrical amount.
Claim 2
Dependent Claim
14 words
A composition as in claim 1 wherein the epoxy curing agent is an aminE.
Claim 3
Dependent Claim
11 words
A composition as in claim 3 wherein the amine is metaphenylenediamine.
Claim 4
Dependent Claim
15 words
A composition as in claim 1 wherein the epoxy curing agent is an acid anhydride.
Claim 5
Dependent Claim
14 words
A composition as in claim 5 wherein the anhydride is methyl (2.2.1) heptene-2,3-dicarboxylic anhydride.
Claim 6
Dependent Claim
15 words
A composition as in claim 1 wherein the epoxy curing agent is a Lewis acid.
Claim 7
Dependent Claim
14 words
A composition as in claim 7 wherein the Lewis acid is a BF3 complex.
References Cited (Backward Citations)
US2938875A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |