US2198967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condensation products of pyrene
Assignee: GAF Chemicals Corp
•
Filing: 1937-11-18
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Granted: 1940-04-30
•
Expires: 1957-11-18
Abstract
No abstract record available.
Inventors
- 👤 Hopff Heinrich
- 👤 Eichel Helmut
- 👤 Schoenherr Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:08
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/003; C07; C07C; C07C15/00; C07C15/20; C07C15/38; Y; Y10; Y10S; Y10S252/00; Y10S252/965
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) | 1943-04-30 | 1943-10-30 | 1944-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-04-30 | 1947-10-30 | 1948-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-04-30 | 1951-10-30 | 1952-04-30 | $7700.00 | Window Closed / Lapsed |