Patent US3639352A successfully refreshed from Google Patents.
US3639352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters of improved dyeability and light fastness
Assignee: Kurashiki Rayon Co Ltd
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Filing: 1969-11-25
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Granted: 1972-02-01
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Expires: 1989-11-25
Abstract
Abstract MODIFIED FILM- OR FIBER-FORMING POLYESTERS HAVING A HIGH AFFINITY FOR BASIC DYES AND IMPROVE LIGHT FASTNESS COMPRISING A LINEAR POLYESTER MODIFIED WITH RADICALS CONTAINING AT LEAT ONE GROUP SELECTED FROM SULFONATE, SULFINATE, PHOSPHATE, PHOSPHINATE AND CARBOXYLATE GROUPS IN THE FORM OF A METAL SALT THEREOF AND A MINOR AMOUNT OF AT LEAST ONE ALIPHATIC COMPOUND HAVING A CARBON TO OXYGEN DOUBLE BOND OR A CARBON TO CARBON DOUBLE BOND CONJUGATED WITH ANOTHER CARBON TO CARBON DOUBLE BOND.
Inventors
- 👤 Kanji Katsuura
- 👤 Keishiro Igi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:03
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/54; C08G63/68; Y; Y10; Y10S; Y10S8/00; Y10S8/04
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |