Patent US3755262A successfully refreshed from Google Patents.
US3755262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transparent high-impact polyurethane products
Assignee: Lockheed Martin Tactical Systems Inc
•
Filing: 1971-01-15
•
Granted: 1973-08-28
•
Expires: 1991-01-15
Abstract
Abstract A polyurethane and method of making said polyurethane which is characterized by being transparent and having good heat distortion and resistance to haze and impact.
Inventors
- 👤 E Slagel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:09
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; B; B29; B29C; B29C33/00; B29C33/56; B29C33/60; B29C33/62; B29C39/00; B29C39/003; B29C39/006; C08G18/28; C08G18/40; C08G18/42; C08G18/44; C08G18/70; C08G18/72; C08G18/74; C08G18/75; B29K; B29K2075/00; B29K2909/00; B29K2909/08; B29K2995/00; B29K2995/0018; Y; Y10; Y10S; Y10S528/00; Y10S528/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
The polyurethane article of claim 1 wherein about 5 to about 40 percent of the reactive hydrogen containing material is a dihydric polyglycol carbonate.
Claim 2
Dependent Claim
17 words
The polyurethane article of claim 1 wherein the reactive hydrogen containing material is a polypropylene ether triol.
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) | 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 |