Patent US3312705A successfully refreshed from Google Patents.
US3312705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2-hydroxy-3-naphthoic acid piperazides
Assignee: Keuffel and Esser Co
•
Filing: 1964-08-07
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Granted: 1967-04-04
•
Expires: 1984-08-07
Abstract
No abstract record available.
Inventors
- 👤 Sus Oskar
- 👤 Dotsch Hans-Dieter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:01
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
A 2-HYDROXY-2-NAPHTHOIC ACID PIPERAZIDE HAVIGN THE FORMULA
Claim 2
Dependent Claim
7 words
A 2-HYDROXY-2-NAPHTHOIC ACID PIPERAZIDE HAVIGN THE FORMULA
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) | 1970-04-03 | 1970-10-03 | 1971-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-03 | 1974-10-03 | 1975-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-03 | 1978-10-03 | 1979-04-04 | $7700.00 | Window Closed / Lapsed |