Patent US2806841A successfully refreshed from Google Patents.
US2806841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymers of alpha-piperidone
Assignee: Arnold Hoffman & Co Inc
•
Filing: 1953-02-24
•
Granted: 1957-09-17
•
Expires: 1973-02-24
Abstract
No abstract record available.
Inventors
- 👤 Carl E Barnes
- 👤 William R Nummy
- 👤 Jr William O Ney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:04
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/14; C08G69/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
FIBER-FORMING HOMO-POLYMERS OF A-PIPERIDONE CONSISTING ESSENTIALLY OF THE RECURRING UNIT
Claim 2
Dependent Claim
10 words
FIBER-FORMING HOMO-POLYMERS OF A-PIPERIDONE CONSISTING ESSENTIALLY OF THE RECURRING UNIT
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) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |