US3062858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing partial esters of pyrophosphoric acid
Assignee: Individual
•
Filing: 1960-04-12
•
Granted: 1962-11-06
•
Expires: 1980-04-12
Abstract
No abstract record available.
Inventors
- 👤 Friedrich D Cramer
- 👤 Manfred G Winter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:55
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/098
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
A PROCESS FOR THE PREPARATION OF A PARTIAL ESTER OF PYROPHOSPHORIC ACID OF THE FORMULA
Claim 2
Dependent Claim
15 words
A PROCESS FOR THE PREPARATION OF A PARTIAL ESTER OF PYROPHOSPHORIC ACID OF 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) | 1965-11-05 | 1966-05-07 | 1966-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-05 | 1970-05-07 | 1970-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-05 | 1974-05-07 | 1974-11-06 | $7700.00 | Window Closed / Lapsed |