Patent US3505296A successfully refreshed from Google Patents.
US3505296A
Expired / Lapsed
US
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Fibre-forming polyamides of improved affinity for acid dyes
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1967-02-16
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Granted: 1970-04-07
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Expires: 1987-02-16
Abstract
No abstract record available.
Inventors
- 👤 Harold George Burrows
- 👤 Stephen John Hepworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:48
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/16; C08G69/26; C08G69/28
Claims Analysis
Total Claims: 0
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US3344107A
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US3365427A
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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) | 1973-04-06 | 1973-10-06 | 1974-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-06 | 1977-10-06 | 1978-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-06 | 1981-10-06 | 1982-04-07 | $7700.00 | Window Closed / Lapsed |