Patent US2843520A successfully refreshed from Google Patents.
US2843520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Products and process
Assignee: EIDP Inc
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Filing: 1956-06-25
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Granted: 1958-07-15
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Expires: 1976-06-25
Abstract
No abstract record available.
Inventors
- 👤 Richard S Kittila
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:12
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/24; C07D213/44; C07D213/53
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
5 words
A COMPOUND OF 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) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |