US3093560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing polyformaldehyde material having improved characteristics
Assignee: Houilleres du Bassin du Nord et du Pas de Calais
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Filing: 1959-07-22
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Granted: 1963-06-11
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Expires: 1979-07-22
Abstract
No abstract record available.
Inventors
- 👤 Fourcade Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:20
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/02; C08G2/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A NON-CATALUYTIC METHOD OF PRODUCING POLYFORMALDEHYDE HAVING MOLECULAR CHAINS OF LONG UNIFORM LENGTH AND WHICH IS STABLE AT ELEVATED TEMPERATURES, COMPRISING EXPOSING FORMALDEHYDE TO A TOTAL DOSE OF HIGH ENERGY, IONIZING IRRADIATION IN THE RANGE BETWEEN APPROXIMATELY 500 AND 100,00 ROENTGEN UNITS AT A TEMPERATURE IN THE RANGE BETWEEN APPROXIMATELY -60*C. AND -190*C.
Claim 2
Dependent Claim
53 words
A NON-CATALUYTIC METHOD OF PRODUCING POLYFORMALDEHYDE HAVING MOLECULAR CHAINS OF LONG UNIFORM LENGTH AND WHICH IS STABLE AT ELEVATED TEMPERATURES, COMPRISING EXPOSING FORMALDEHYDE TO A TOTAL DOSE OF HIGH ENERGY, IONIZING IRRADIATION IN THE RANGE BETWEEN APPROXIMATELY 500 AND 100,00 ROENTGEN UNITS AT A TEMPERATURE IN THE RANGE BETWEEN APPROXIMATELY -60*C. AND -190*C.
References Cited (Backward Citations)
US2734889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-06-10 | 1966-12-10 | 1967-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-10 | 1970-12-10 | 1971-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-10 | 1974-12-10 | 1975-06-11 | $7700.00 | Window Closed / Lapsed |