US2673213A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyalkylene polyamino acids
Assignee: Individual
•
Filing: 1952-06-03
•
Granted: 1954-03-23
•
Expires: 1972-06-03
Abstract
No abstract record available.
Inventors
- 👤 Frederick C Bersworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:56
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/25; C07C309/26; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; Y; Y10; Y10S; Y10S71/00; Y10S71/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
CHEMICAL COMPOUNDS CORRESPONDING TO THE GENERAL FORMULA:
Claim 2
Dependent Claim
7 words
CHEMICAL COMPOUNDS CORRESPONDING TO THE GENERAL FORMULA:
References Cited (Backward Citations)
US2176441A
Cited
US2316606A
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US2316636A
Cited
US2407645A
Cited
US2428353A
Cited
US2413856A
Cited
US2532391A
Cited
US2609390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |