US3450646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heterocyclic polymers
Assignee: Baker Petrolite LLC
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Filing: 1965-10-22
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Granted: 1969-06-17
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Expires: 1985-10-22
Abstract
No abstract record available.
Inventors
- 👤 Robert R Annand
- 👤 Brian M Rushton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:28
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; B; B01; B01D; B01D17/00; B01D17/02; B01D17/04; B01D17/047; C08; C08G; C08G73/00; C08G73/06; C08G73/0605; C08G73/0616
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE739037C
Cited
US2374354A
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GB865686A
Cited
US3210371A
Cited
US3174947A
Cited
US3166521A
Cited
US3218270A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-16 | 1972-12-16 | 1973-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-16 | 1976-12-16 | 1977-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-16 | 1980-12-16 | 1981-06-17 | $7700.00 | Window Closed / Lapsed |