Patent US3240643A successfully refreshed from Google Patents.
US3240643A
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Method and apparatus for making a flexible insulated duct
Assignee: PPG Industries Inc
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Filing: 1962-04-12
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Granted: 1966-03-15
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Expires: 1982-04-12
Abstract
No abstract record available.
Inventors
- 👤 Clifford A Schroeder
- 👤 Quentin L Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:44
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/02; F24F13/0263; F16; F16L; F16L59/00; F16L59/14; F16L59/153; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1028; Y10T156/103
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A METHOD FOR MAKING A THERMALLY AND ACOUSTICALLY INSULATED DUCT COMPRISING THE STEPS OF: FORMING A STIFFLY FLEXIBLE ELEMENT INTO A PLURALITY OF SPACED CONVOLUTIONS TO FORM A HELIX, CONVOLUTELY WRAPPING A COMPRESSIBLE BLANKET OF POROUS INSULATING MATERIAL HAVING A WIDTH EQUAL TO THE DUCT LENGTH AROUND SAID PLURALITY OF CONVOLUTIONS, AND ENCIRCLING AND ONLY SLIGHTLY COMPRESSING SAID BLANKET WITH A FLEXIBLE SLEEVE FOR CONFORMING TO THE SURFACE OF AND SERVING AS A COVERING FOR THE BLANKET.
Claim 2
Independent Claim
77 words
A METHOD FOR MAKING A THERMALLY AND ACOUSTICALLY INSULATED DUCT COMPRISING THE STEPS OF: FORMING A STIFFLY FLEXIBLE ELEMENT INTO A PLURALITY OF SPACED CONVOLUTIONS TO FORM A HELIX, CONVOLUTELY WRAPPING A COMPRESSIBLE BLANKET OF POROUS INSULATING MATERIAL HAVING A WIDTH EQUAL TO THE DUCT LENGTH AROUND SAID PLURALITY OF CONVOLUTIONS, AND ENCIRCLING AND ONLY SLIGHTLY COMPRESSING SAID BLANKET WITH A FLEXIBLE SLEEVE FOR CONFORMING TO THE SURFACE OF AND SERVING AS A COVERING FOR THE BLANKET.
References Cited (Backward Citations)
US1901330A
Cited
US2106018A
Cited
US2312282A
Cited
US2342647A
Cited
US2557932A
Cited
US2597806A
Cited
US2748831A
Cited
US2858854A
Cited
US2729268A
Cited
US2861598A
Cited
GB854528A
Cited
US2943644A
Cited
US2980144A
Cited
US3083130A
Cited
US3106504A
Cited
US3143306A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-14 | 1969-09-13 | 1970-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-14 | 1973-09-13 | 1974-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-14 | 1977-09-13 | 1978-03-15 | $7700.00 | Window Closed / Lapsed |