US3346665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for curing polyepoxides with pyromellitic diimide or adducts thereof and resulting products
Assignee: Shell USA Inc
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Filing: 1965-03-15
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Granted: 1967-10-10
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Expires: 1985-03-15
Abstract
No abstract record available.
Inventors
- 👤 Carl G Schwarzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:08
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/4007; C08G59/4014; C08G59/4042
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A PROCESS FOR PROVIDING CURED POLYEPOXIDE SYSTEMS HAVING IMPROVED PROPERTIES AT ELEVATED TEMPERATURES WHICH COMPRISES (A) MIXING A STOICHIOMETRIC AMOUNT OF A DIMIDE SELECTED FROM TYHE GROUP CONSISTING OF PYROMELLITIC DIIMIDE AND THE COMPOUND FORMED BY REACTING 2 MOLES OF PYROMELLITIC DIMIDE AND 1 MOLE OF A DIHALIDE OF A DICARBOXYLIC ACID WITH A POLYEPOXIDE POSSESSING MORE THAN ONE VICINAL EPOXY GROUP, AND (B) HEATING THE RESULTING MIXTURE AT A TEMPERATURE RANGING FROM ABOUT 250* TO 650*F.
Claim 2
Dependent Claim
77 words
A PROCESS FOR PROVIDING CURED POLYEPOXIDE SYSTEMS HAVING IMPROVED PROPERTIES AT ELEVATED TEMPERATURES WHICH COMPRISES (A) MIXING A STOICHIOMETRIC AMOUNT OF A DIMIDE SELECTED FROM TYHE GROUP CONSISTING OF PYROMELLITIC DIIMIDE AND THE COMPOUND FORMED BY REACTING 2 MOLES OF PYROMELLITIC DIMIDE AND 1 MOLE OF A DIHALIDE OF A DICARBOXYLIC ACID WITH A POLYEPOXIDE POSSESSING MORE THAN ONE VICINAL EPOXY GROUP, AND (B) HEATING THE RESULTING MIXTURE AT A TEMPERATURE RANGING FROM ABOUT 250* TO 650*F.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |