US3755659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of determining the surface area of an irregular shape
Assignee: Motors Liquidation Co
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Filing: 1972-06-15
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Granted: 1973-08-28
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Expires: 1992-06-15
Abstract
Abstract The method of measuring the area of a tire print including the steps of making a photographic negative of the tire print, weighing a circuit board having a full copper layer, etching away by a photoetching process the copper on the circuit board except for copper within the boundaries defined by the surface area to be measured to produce a copper pattern having an area equal to the area of the tire print, reweighing the circuit board, removing the remaining copper on the circuit board, reweighing the circuit board with all the copper removed, and multiplying the ratio of the weight of the copper pattern to the total weight of the copper removed times the total area of the printed circuit board.
Inventors
- 👤 J Bolhuis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:08
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
200 words
The method of determining the area of an irregular shape comprising the steps of weighing a circuit board having a substrate carrying a conductive layer having a known area; making a photographic negative of the irregular shape; photoetching the conductive layer from the substrate external of the boundaries of the irregular shape as determined by the photographic negative to form a conductive layer pattern having an area equal to the area of the irregular shape; reweighing the circuit board; removing the remaining portion of the conductive layer from the substrate; and weighing the substrate, whereby subtraction of the weight of the substrate from the weight of the circuit board with the conductive layer photoetched from the substrate external from the boundaries of the irregular shape gives the weight of the conductive layer pattern, the subtraction of the weight of the substrate from the weight of the circuit board prior to the photoetching of the conductive layer gives the total weight of the conductive layer and the product of the ratio of the weight of the conductive layer pattern to the total weight of the conductive layer and the area of the conductive layer gives the area of the irregular shape.
Claim 2
Independent Claim
200 words
The method of determining the area of an irregular shape comprising the steps of weighing a circuit board having a substrate carrying a conductive layer having a known area; making a photographic negative of the irregular shape; photoetching the conductive layer from the substrate external of the boundaries of the irregular shape as determined by the photographic negative to form a conductive layer pattern having an area equal to the area of the irregular shape; reweighing the circuit board; removing the remaining portion of the conductive layer from the substrate; and weighing the substrate, whereby subtraction of the weight of the substrate from the weight of the circuit board with the conductive layer photoetched from the substrate external from the boundaries of the irregular shape gives the weight of the conductive layer pattern, the subtraction of the weight of the substrate from the weight of the circuit board prior to the photoetching of the conductive layer gives the total weight of the conductive layer and the product of the ratio of the weight of the conductive layer pattern to the total weight of the conductive layer and the area of the conductive layer gives the area of the irregular shape.
Claim 3
Independent Claim
219 words
The method of determining the area of a tire print comprising the steps of weighing a circuit board having a substrate carrying a conductive layer having a known area; making an image of the tire print; making a photographic negative of the image of the tire print; photoetching the conductive layer from the substrate external of the boundaries of the image of the tire print as determined by the photographic negative to form a conductive layer pattern having an area equaL to the area of the image of the tire print; reweighing the circuit board; removing the remaining portion of the conductive layer from the substrate; and weighing the substrate, whereby subtraction of the weight of the substrate from the weight of the circuit board with the conductive layer photoetched from the substrate external from the boundaries of the image of the tire print gives the weight of the conductive layer pattern, the subtration of the weight of the substrate from the weight of the circuit board prior to the photoetching of the conductive layer gives the total weight of the conductive layer and the product of the ratio of the weight of the conductive layer pattern to the total weight of the conductive layer and the area of the conductive layer gives the area of the tire print.
Claim 4
Independent Claim
219 words
The method of determining the area of a tire print comprising the steps of weighing a circuit board having a substrate carrying a conductive layer having a known area; making an image of the tire print; making a photographic negative of the image of the tire print; photoetching the conductive layer from the substrate external of the boundaries of the image of the tire print as determined by the photographic negative to form a conductive layer pattern having an area equaL to the area of the image of the tire print; reweighing the circuit board; removing the remaining portion of the conductive layer from the substrate; and weighing the substrate, whereby subtraction of the weight of the substrate from the weight of the circuit board with the conductive layer photoetched from the substrate external from the boundaries of the image of the tire print gives the weight of the conductive layer pattern, the subtration of the weight of the substrate from the weight of the circuit board prior to the photoetching of the conductive layer gives the total weight of the conductive layer and the product of the ratio of the weight of the conductive layer pattern to the total weight of the conductive layer and the area of the conductive layer gives the area of the tire print.
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 |