US3553292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Product and a method of improving the shelf life of uncured polyesters
Assignee: WR Grace and Co
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Filing: 1968-12-10
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Granted: 1971-01-05
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Expires: 1988-12-10
Abstract
Abstract INHIBITORS, SUCH AS, 2-(2-AMINOETHYLAMINO)-5-NITROPYRIDINE, ARE ADDED TO UNCURED POLYESTER RESIN SYSTEMS TO PREVENT GELATION OF THOSE SYSTEMS WHEN THEY ARE STORED AT ROOM TEMPERATURE OR AT ELEVATED TEMPERATURES FOR PERIODS OF TIME IN EXCESS OF THREE YEARS. BETWEEN 0.5 AND 1.0 MOLE PERCENT INHIBITOR IS ADDED TO THE UNCURED POLYESTER SYSTEMS.
Inventors
- 👤 Eldon E Stahly
- 👤 Edwin W Lard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:38
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3412; C08K5/3432
Claims Analysis
Total Claims: 0
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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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |