Patent US3285878A successfully refreshed from Google Patents.
US3285878A
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US
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Polymerization of formaldehyde
Assignee: Cabot Corp
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Filing: 1965-10-23
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Granted: 1966-11-15
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Expires: 1985-10-23
Abstract
No abstract record available.
Inventors
- 👤 James C Mackenzie
- 👤 Joel A Yancey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:54
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/06; C08G2/08; C08G2/12; C08G2/14; C08G2/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A PROCESS FOR POLYMERIZING FORMALDEHYDE, PARAFORMALDEHYDE, TRIOXANE, OR MIXTURES THEREOF WHICH COMPRISES CONTACTING SAID SUBSTANCE AT TEMPERATURES BETWEEN ABOUT -80*C. AND ABOUT 190*C. WITH A CATALYST COMPRISING A FINELY-DIVIDED INORGANIC SOLID HAVING AN AVERAGE PARTICLE DIAMETER OF LESS THAN ABOUT 0.1 MICRON AND CARRYING IN CHEMICAL COMBINATION ON THE SURFACE THERE OF AT LEAST ABOUT 1 X 10**4 EQUIVALENTS PER GRAM OF STRUCTURES CONFORMING TO THE FORMULA
Claim 2
Dependent Claim
67 words
A PROCESS FOR POLYMERIZING FORMALDEHYDE, PARAFORMALDEHYDE, TRIOXANE, OR MIXTURES THEREOF WHICH COMPRISES CONTACTING SAID SUBSTANCE AT TEMPERATURES BETWEEN ABOUT -80*C. AND ABOUT 190*C. WITH A CATALYST COMPRISING A FINELY-DIVIDED INORGANIC SOLID HAVING AN AVERAGE PARTICLE DIAMETER OF LESS THAN ABOUT 0.1 MICRON AND CARRYING IN CHEMICAL COMBINATION ON THE SURFACE THERE OF AT LEAST ABOUT 1 X 10**4 EQUIVALENTS PER GRAM OF STRUCTURES CONFORMING TO 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) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |