US2671728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic diazotype developing composition
Assignee: PAKKO LAB Inc
•
Filing: 1952-04-16
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Granted: 1954-03-09
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Expires: 1972-04-16
Abstract
No abstract record available.
Inventors
- 👤 Benjamin W Colman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:15
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
33 words
A REPRODUCTION DEVELOPER OF THE CLASS DESCRIBED CONSISTING OF FROM 10% TO 60% CONCENTRATED 26* BAUME AMMONIUM HYDORXIDE, 5% TO 85% WATER, AND 5% TO 60% HYDROGEN PEROXIDE OF 5% CONCENTRATION, BY VOLUME.
Claim 2
Dependent Claim
33 words
A REPRODUCTION DEVELOPER OF THE CLASS DESCRIBED CONSISTING OF FROM 10% TO 60% CONCENTRATED 26* BAUME AMMONIUM HYDORXIDE, 5% TO 85% WATER, AND 5% TO 60% HYDROGEN PEROXIDE OF 5% CONCENTRATION, BY VOLUME.
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) | 1957-03-08 | 1957-09-07 | 1958-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-08 | 1961-09-07 | 1962-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-08 | 1965-09-07 | 1966-03-09 | $7700.00 | Window Closed / Lapsed |