US3507904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel tetrahydrophthalamic acids and derivatives thereof
Assignee: Individual
•
Filing: 1966-04-01
•
Granted: 1970-04-21
•
Expires: 1986-04-01
Abstract
No abstract record available.
Inventors
- 👤 Herbert Schwartz
- 👤 Joseph B Skaptason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:40
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/44; C07D209/48; A; A01; A01N; A01N37/00; A01N37/18; A01N37/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2556665A
Cited
US2821467A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-04-20 | 1973-10-20 | 1974-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-20 | 1977-10-20 | 1978-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-20 | 1981-10-20 | 1982-04-21 | $7700.00 | Window Closed / Lapsed |