Patent US4024586A successfully refreshed from Google Patents.
Patent US3274161A successfully refreshed from Google Patents.
US3274161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymers of n, n'-tetrahydro-bipyridyl-biquinolyl and-biacridyl dicarboxylic acid derivatives
Assignee: Union Oil Company of California
•
Filing: 1964-01-09
•
Granted: 1966-09-20
•
Expires: 1984-01-09
Abstract
No abstract record available.
Inventors
- 👤 Walter E Kramer
- 👤 Louis A Joo
- 👤 Robert M Haines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:17
CPC Classifications
C; C07; C07D; C07D211/00; C07D211/04; C07D211/80; C07D211/82; C07D211/92; C07D219/00; C07D219/02; C08; C08G; C08G63/00; C08G63/68; C08G63/685; C08G63/6854; C08G63/6856; C10; C10L; C10L7/00; C10L7/02; C10M; C10M1/00; C10M1/08; C10M5/00; C10M2201/00; C10M2201/02; C10M2215/00; C10M2215/22; C10M2215/221; C10M2215/225; C10M2215/226; C10M2215/24; C10M2215/30; C10N; C10N2010/00; C10N2010/02; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
A POLYMER PRODUCED BY REACTION OF A STRONG MINERAL ACID IN AQUEOUS SOLUTION WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF
Claim 2
Dependent Claim
22 words
A POLYMER PRODUCED BY REACTION OF A STRONG MINERAL ACID IN AQUEOUS SOLUTION WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF
References Cited (Backward Citations)
US3147262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |