Patent US3578075A successfully refreshed from Google Patents.
US3578075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrugated tubing
Assignee: Olin Corp
•
Filing: 1969-10-29
•
Granted: 1971-05-11
•
Expires: 1989-10-29
Abstract
Abstract The disclosure teaches an improved corrugated metal tubing having improved corrosion resistance and heat transfer characteristics. The tubing is characterized by having a plurality of lands and grooves extending helically along the circumference thereof and having in cross section a plurality of uniform, symmetrical, wavelike indentations.
Inventors
- 👤 Joseph Winter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:08
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/42; F28F1/424; F28F1/426; B; B21; B21D; B21D15/00; B21D15/04; F28F1/02; F28F1/06; F28F2210/00; F28F2210/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
32 words
A tube according to claim 1 wherein said grooves comprise four independent, continuous grooves extending helically along the circumference of the tube, with each groove being in spaced relationship to each other.
Claim 2
Dependent Claim
30 words
A tube according to claim 1 having an uncorrugated end portion with the wall thickness of said uncorrugated portion being substantially equal to the wall thickness of said corrugated portion.
Claim 3
Dependent Claim
22 words
A tube according to claim 1 wherein the groove width is greater than the groove depth by from 25 to 50 percent.
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |