Patent US2454270A successfully refreshed from Google Patents.
US3307590A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipe insulation
Assignee: Individual
•
Filing: 1963-10-15
•
Granted: 1967-03-07
•
Expires: 1983-10-15
Abstract
No abstract record available.
Inventors
- 👤 Charles R Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:12
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/14; F16L59/16; F16L59/18; F16L59/20; F16L59/04; F16L59/22; Y; Y10; Y10S; Y10S138/00; Y10S138/09
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
76 words
A PIPE INSULATION IN THE FORM OF AN INTEGRAL UNIT COMPRISING A THIN SHELL OF ALUMINUM SPACED FROM THE PIPE TO BE PROTECTED, SPACED INSULATING SPACERS OF PREFORMED URETHANE FOAM BETWEEN THE PIPE AND SHELL HOLDING THE OUTER SHELL IN POSITION ABOUT THE PIPE TO BE PROTECTED AND FOAMED URETHANE FOAMED BETWEEN THE PIPE AND SHELL FILLING THE SHELL AND SELF ADHERING TO THE SHELL AND TO THE INSULATING SPACERS TO FORM A CONTINUOUS UNITARY MASS.
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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |