US3756819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic mordants
Assignee: 3M UK Holdings Ltd
•
Filing: 1971-06-14
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Granted: 1973-09-04
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Expires: 1991-06-14
Abstract
Abstract A POLYMERIC MATERIAL USEFUL FOR MORDANTING DYES IN A PHOTOGRAPHIC ELEMENT, THE POLYMERIC MATERIAL CONTAINING RECURRING QUATERNARY AMMONIUM GROUPS WHICH HAVE COVALENTLY BONDED TO THE NITROGEN ATOMS THEREOF ALLYL GROUPS.
Inventors
- 👤 R Sinclair
- 👤 L Errede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:44
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C1/835; C; C08; C08F; C08F8/00; C08F8/44; Y; Y10; Y10S; Y10S430/00; Y10S430/156; Y10S526/00; Y10S526/923
Claims Analysis
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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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |