US2743299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of tetrakis(hydroxymethyl) phosphonium chloride
Assignee: Individual
•
Filing: 1953-06-12
•
Granted: 1956-04-24
•
Expires: 1973-06-12
Abstract
No abstract record available.
Inventors
- 👤 Francis F Flynn
- 👤 Wilson A Reeves
- 👤 John D Guthrie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:59
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/54; C07F9/5407
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A PROCESS OF PRODUCING TETRAKIS(HYDROXYMETHYL) PHOSPHONIUM CHLORIDE, COMPRISING, REACTING PHOSPHINE WITH AN AGITATED AQUEOUS SOLUTION OF FORMALDEHYDE AND HYDROCHLORIC ACID, CONTAINING FROM ABOUT 4 TO 6 MOLES OF FORMALDEHYDE PER MOLE OF HYDROCHLORIC ACID, AT A TEMPERATURE OF FROM ABOUT 10* C. TO 30* C.
Claim 2
Dependent Claim
45 words
A PROCESS OF PRODUCING TETRAKIS(HYDROXYMETHYL) PHOSPHONIUM CHLORIDE, COMPRISING, REACTING PHOSPHINE WITH AN AGITATED AQUEOUS SOLUTION OF FORMALDEHYDE AND HYDROCHLORIC ACID, CONTAINING FROM ABOUT 4 TO 6 MOLES OF FORMALDEHYDE PER MOLE OF HYDROCHLORIC ACID, AT A TEMPERATURE OF FROM ABOUT 10* C. TO 30* C.
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) | 1959-04-24 | 1959-10-24 | 1960-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-24 | 1963-10-24 | 1964-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-24 | 1967-10-24 | 1968-04-24 | $7700.00 | Window Closed / Lapsed |