Patent US3528937A successfully refreshed from Google Patents.
US3528937A
Expired / Lapsed
US
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Aqueous solutions of polyamide acids
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1968-02-15
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Granted: 1970-09-15
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Expires: 1988-02-15
Abstract
No abstract record available.
Inventors
- 👤 Reginald John William Reynolds
- 👤 John David Seddon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:35
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1003; C08G73/1007; C08G73/1028; C08G73/1032; D; D01; D01F; D01F6/00; D01F6/58; D01F6/74; D01F6/76; Y; Y10; Y10S; Y10S264/00; Y10S264/47
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3067158A
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US3190856A
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US3247139A
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US3179631A
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US3305501A
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US3242136A
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US3321429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |