US3592671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of cellulose ester dopes
Assignee: Eastman Kodak Co
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Filing: 1969-12-22
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Granted: 1971-07-13
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Expires: 1989-12-22
Abstract
Abstract THE USE OF A SMALL AMOUNT OF 1,2-PROPYLENE OXIDE IN CELLULOSE ESTER DOPES HAS BEEN FOUND TO RESULT IN THE STABILIZATION OF SUCH DOPES TO A SIGNIFICANT DEGREE AGAINST THE FORMATION OF AMBER OR BROWNISH-RED INSOLUBLE GLOBULES IN THE DOPE.
Inventors
- 👤 Carl J Malm
- 👤 Walker F Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:18
CPC Classifications
C; C08; C08B; C08B3/00; C08B3/22; C08B3/30; C08K; C08K5/00; C08K5/04; C08K5/15; C08K5/151; C08K5/1515
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |