US3494786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated perphthalic acid and method of making same
Assignee: PPG Industries Inc
•
Filing: 1966-12-19
•
Granted: 1970-02-10
•
Expires: 1986-12-19
Abstract
No abstract record available.
Inventors
- 👤 Donald R Nielsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:51
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/39; C11D3/3902; C11D3/3905; C11D3/3935; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2989; Y10T428/2991
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2287064A
Cited
US2347434A
Cited
US2423451A
Cited
US2448252A
Cited
BE560389A
Cited
US3231605A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |