US2498722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid diazo complexes
Assignee: GAF Chemicals Corp
•
Filing: 1945-07-04
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Granted: 1950-02-28
•
Expires: 1965-07-04
Abstract
No abstract record available.
Inventors
- 👤 James M Straley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:53
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30; C08F8/32
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
49 words
THE COMPLEX SALT OF AN AROMATIC LIGHT SENSITIVE DIAZO COMPOUND AND A SULFONATED RESIN SELECTED FROM THE CLASS CONSISTING OF A SULFONATED CUMMARONE-INDENE RESIN, SULFONATED POLYBENZYL RESIN, THE FORMALDEHYDE CONDENSATION PRODUCT OF B-NAPHTHALENE SULFONIC ACID AND THE POLYMERIZED SODIUM SALT OF FORMALDEHYDE NAPHTHALENE SULFONIC ACID. OF FORMALDEHYDE NAPHTHALENE SU
References Cited (Backward Citations)
GB191204648A
Cited
US1093567A
Cited
US1500844A
Cited
CH162738A
Cited
US2100063A
Cited
US2063631A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-27 | 1953-08-29 | 1954-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-27 | 1957-08-29 | 1958-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-27 | 1961-08-29 | 1962-02-28 | $7700.00 | Window Closed / Lapsed |