US3575699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic products and processes comprising alkali-hydrolyzable antifoggant precursors
Assignee: Polaroid Corp
•
Filing: 1968-09-03
•
Granted: 1971-04-20
•
Expires: 1988-09-03
Abstract
Abstract ANTIFOGGANT PRECURSORS OF THE FORMULA A-Z, WHEREIN A IS AN ANTIFOGGANT NUCLEUS RESULTANT FROM THE DEPROTONIZATION OF THE ANTIFOGGANT A-H, AND ZIS A MOIETY WHICH MASKS THE ANTIFOGGANT FUNCTIONALITY OF A, PROVIDE SUBSTANTIALLY NO ANTIFOGGANT EFFECT ON PHOTOGRAPHIC SYSTEMS IN WHICH THEY ARE CONTAINED UNTIL CLEAVAGE OF THE MASKING MOIETY FROM THE ANTIFOGGANT NUCLEUS IS ACCOMPLISHED.
Inventors
- 👤 Stanley M Bloom
- 👤 Howard G Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:27
CPC Classifications
C; C07; C07D; C07D235/00; C07D235/02; C07D235/04; C07D235/06; C07D249/00; C07D249/16; C07D249/18; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34; G03C8/00; Y; Y10; Y10S; Y10S430/00; Y10S430/156
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |