US3257476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Block copolymers having urethane linkages between a preformed polymer having at least one active hydrogen atom and a polyvinyl chain
Assignee: Individual
•
Filing: 1961-09-05
•
Granted: 1966-06-21
•
Expires: 1981-09-05
Abstract
No abstract record available.
Inventors
- 👤 Arthur V Tobolsky
- 👤 Rembaum Alan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:16
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/83; C08G18/86; C08F; C08F293/00; C08F4/00; C08F4/28; C08F4/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
12 words
AS A NEW COMPOUND, A BLOCK COPOLYMER CORRESPONDING TO THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
12 words
AS A NEW COMPOUND, A BLOCK COPOLYMER CORRESPONDING TO THE FOLLOWING FORMULA:
Claim 3
Dependent Claim
19 words
AS A NEW COMPOUND, A BLOCK COPOLYMER CONTAINING REPEATING UNITS, EACH UNIT CORRESPONDING TO THE FOLLOWING FORMULA: $(ARA)Z$ WHEREIN
Claim 4
Dependent Claim
19 words
AS A NEW COMPOUND, A BLOCK COPOLYMER CONTAINING REPEATING UNITS, EACH UNIT CORRESPONDING TO THE FOLLOWING FORMULA: $(ARA)Z$ WHEREIN
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) | 1969-06-20 | 1969-12-20 | 1970-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-20 | 1973-12-20 | 1974-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-20 | 1977-12-20 | 1978-06-21 | $7700.00 | Window Closed / Lapsed |