Patent US3297745A successfully refreshed from Google Patents.
US3297745A
Expired / Lapsed
US
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Ethylenically unsaturated di-and tetra-urethane monomers
Assignee: Freeman Chemical Corp
•
Filing: 1962-04-05
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Granted: 1967-01-10
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Expires: 1982-04-05
Abstract
No abstract record available.
Inventors
- 👤 Fekete Frank
- 👤 Patrick J Keenan
- 👤 William J Plant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:24
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/34; Y; Y10; Y10S; Y10S525/00; Y10S525/92
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
8 words
A POLYMERIZABLE DIVINYL DIURETHANE MONOMER HAVING THE FORMULA
Claim 2
Dependent Claim
8 words
A POLYMERIZABLE DIVINYL DIURETHANE MONOMER HAVING THE FORMULA
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-09 | 1970-07-11 | 1971-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-09 | 1974-07-11 | 1975-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-09 | 1978-07-11 | 1979-01-10 | $7700.00 | Window Closed / Lapsed |