Patent US4634430A successfully refreshed from Google Patents.
US3000880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of epsilon caprolactams
Assignee: —
•
Filing: —
•
Granted: 1961-09-19
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Expires: 1978-09-19
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:37
CPC Classifications
C; C07; C07D; C07D201/00; C07D201/02; C07D201/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
A PROCESS FOR THE PRODUCTION OF EPSILON-CAPROLACTAMS CHARACTERIZED BY THE FORMULA
Claim 2
Dependent Claim
11 words
A PROCESS FOR THE PRODUCTION OF EPSILON-CAPROLACTAMS CHARACTERIZED BY THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |