Patent US2834798A successfully refreshed from Google Patents.
US2834798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heterocyclic phosphorus compounds
Assignee: Columbia Chemical Corp
•
Filing: 1957-12-20
•
Granted: 1958-05-13
•
Expires: 1977-12-20
Abstract
No abstract record available.
Inventors
- 👤 Hechenbleikner Ingenuin
- 👤 Pause Carl William
- 👤 Francis C Lanoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:54
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6571; C07F9/6574; C07F9/65742; C07F9/65746
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
4 words
CYCLIC PHOSPHITES HAVING FORMULA:
Claim 2
Dependent Claim
4 words
CYCLIC PHOSPHITES HAVING FORMULA:
Claim 3
Dependent Claim
10 words
A PROCESS OF PREPARING A CYCLIC PHOSPHITE HAVING THE FORMULA:
Claim 4
Dependent Claim
10 words
A PROCESS OF PREPARING A CYCLIC PHOSPHITE HAVING 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) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |