Patent US3544490A successfully refreshed from Google Patents.
US3544490A
Expired / Lapsed
US
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Ethylene polymer foam compositions and process for making same
Assignee: Gulf Research and Development Co
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Filing: 1967-01-04
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Granted: 1970-12-01
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Expires: 1987-01-04
Abstract
No abstract record available.
Inventors
- 👤 Richard L Alexander
- 👤 Donald G Ashburn
- 👤 Bert H Clampitt
- 👤 Harry D Anspon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:47
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J9/102; C08J9/103; C08F; C08F255/00; C08F255/02; C08J2323/00; C08J2323/02; C08J2323/04
Claims Analysis
Total Claims: 0
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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) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |