US3755443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
4,4'-alkylene bis(semicarbazide)and derivatives thereof
Assignee: Pennwalt Corp
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Filing: 1970-06-22
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Granted: 1973-08-28
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Expires: 1990-06-22
Abstract
Abstract THE COMPOUND 4,4''-ETHYLENE BIS(SEMICARBAZIDE) IS PREPARED, SAID COMPOUND BEING UTILE IN POLYMER FORMATION.
Inventors
- 👤 C Sheppard
- 👤 Leay R Mac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:16
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/16; C07D295/20; C07D295/215; C08; C08F; C08F283/00; C08F283/01; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3819; C08G18/3823; C08G18/3834; C08G73/00; C08G73/06; C08G73/08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08J9/102; C08K; C08K5/00; C08K5/16; C08K5/22; C08K5/23; C08K5/235; C08K5/24; C08K5/26
Claims Analysis
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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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |