US2990421A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Neutral esters of phosphoric acid
Assignee: Virginia Carolina Chemical Corp
•
Filing: 1958-04-01
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Granted: 1961-06-27
•
Expires: 1978-04-01
Abstract
No abstract record available.
Inventors
- 👤 Melton Thomas Mason
- 👤 Richard A Matthews
- 👤 Harry F O'connor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:23
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/091; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/521
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
10 words
A NEUTRAL ESTER OF PHOSPHORIC ACID OF THE GENERAL FORMULA
Claim 2
Dependent Claim
10 words
A NEUTRAL ESTER OF PHOSPHORIC ACID OF THE GENERAL FORMULA
References Cited (Backward Citations)
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US2909559A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |