US2230789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymethine dyestuffs
Assignee: GAF Chemicals Corp
•
Filing: 1938-11-12
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Granted: 1941-02-04
•
Expires: 1958-11-12
Abstract
No abstract record available.
Inventors
- 👤 Winter Carl
- 👤 Roh Nikolaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:59
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/14; C09B23/145; C09B11/00; C09B11/04; C09B11/10; C09B11/12; C09B11/26; C09B23/02; C09B23/06; C09B23/10; C09B23/105
Claims Analysis
Total Claims: 0
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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) | 1944-02-04 | 1944-08-05 | 1945-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-02-04 | 1948-08-05 | 1949-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-02-04 | 1952-08-05 | 1953-02-04 | $7700.00 | Window Closed / Lapsed |