The dating scheme is based on several sources including dated advertisements, patent numbers, the very fine book by Joan Palicia referenced on page one of this site, and a few brochures by the company. We have made certain assumptions in dating the sleds. The most important assumption is that when changes were made, they were for better engineering. Also, the graphics reflect a more simple design as the years passed. Numerous writers have added anecdotal material as to when their families purchased their sleds and some sleds even have dates inscribed on them by the owners, along with their names. For an overall picture, we know that the first S L Allen patent was in and that the company was sold in the s. The U S Patent Office recognizes the company at its website: An articulated steering bumper came out around , and those seem to be the major engineering modifications. However, numerous nuances also occurred along the way and we will spotlight them in the following entries.
One rich source of information is found in the United State Patent Office which registers invention patents, design patents, trademark registrations, and label registrations. If your collectible has a patent number then information about its history is recorded. Most any large city library will have a complete set of these documents, the most useful to bottle collectors is the Patent Office Official Gazette.
All of the patents, designs, trademarks and labels were recorded in a document known as the Official Gazette.
What Patent Numbers Mean The first Patent Act was signed into effect by George Washington on April 10, Three and a half months later, on July 31, , the first U.S. patent for a Method Of Making Pot Ash Useful In Soap Production was issued to Samuel Hopkins of Philadelphia.
The example below uses information from the American Waltham Watch Company, but that is just an example. You should consult the serial number table for the specific brand of watch movement you are trying to date by selecting a company from the menu on the left. Not all vintage watches can be dated using the serial number. Some American watch brands did not use a consistent series of serial numbers, but most of the big manufacturers did. Most vintage Swiss pocket watches did NOT have serial numbers and can’t be dated by this method.
Can’t find YOUR exact serial number in our lookup tables? Many watch companies made hundreds of thousands of watches, and some companies made millions of watches!
Dating uk patent numbers
Q: What years was the flower pot headstock inlay available on the Tubaphone style 3, 5 string banjo? DL A: Roughly to , the last serial number seen was Q: When did Vega (Fairbanks plate models) switch the Whyte Laydie models from a grooved/slotted stretcher band to a notched one? Fairbanks plate to F-V stamp to Vega stamp? Ferrule? Hooks? Rim.
Unique Slide Rule Company Dating a slide rule becomes difficult if a manufacturer did not imprinting a date code or serial number on the stock. Even then, some manufacturers recycled their serial numbers over time, and the stock could have been left on a shelf for a period of time before the slide rule was assembled and shipped. Catalogs are an excellent indication of when a model was produced or discontinued. Sometimes the copyright date in a manual is used to determine the approximate age, but one printing could span several decades.
Dates that a design was registered or patented only suggests an approximate year a model may have been first produced, as the model may have been distributed a year or more before issuance patent pending. The patent may only refer to a certain combination of scales used over a thirty year time on different models. Having contact with the original owner of a slide rule that remembers the year it was purchased helps on determining the age.
901 Prior Art [R-08.2012]
What type of bottle is it? This entire website is essentially a “key” – albeit a complex one – to the dating and typing typology of historic bottles. In addition, this site also assists the user with these questions: What technology, techniques, or processes were used to manufacture the bottle?
Dating uk patent numbers. is a patent date after which any for the uk intellectual property office and date of u. Advanced patent numbers of successful u. How of the u. Advanced patent number, when an item was registered. How of british inventors; some inventors; some inventors are from the grant of april , return patents.
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444 Angel Number | Spiritual Meaning of 444
While guitarists in the early part of this century played country, folk or blues on acoustic guitars, in the ‘s, jazz musicians experimented with amplifying traditional hollow-body guitars so they could play with other instruments at the same sound level. One problem was that the speakers and pickups tended to generate feedback when played at a high level.
In the ‘s, a California inventor named Leo Fender had made some custom guitars and amplifiers in his radio shop.
The “N os” (with an “s”) stamping coming after “PATENT” indicates a pipe with a double patent. The first patent number (/12) is legible and corresponds to the English Innertube patent. A more accurate dating would be risky as to the lack of a year suffix. Both of the two numbers correspond to patents granted for Canada. /
History[ edit ] Carbon tetrachloride CCl4 was used in fire extinguishers and glass “anti-fire grenades” from the late nineteenth century until around the end of World War II. Experimentation with chloroalkanes for fire suppression on military aircraft began at least as early as the s. Freon is a trade name for a group of CFCs which are used primarily as refrigerants , but also have uses in fire-fighting and as propellants in aerosol cans. Bromomethane is widely used as a fumigant.
Dichloromethane is a versatile industrial solvent. In the late s, Thomas Midgley, Jr. In searching for a new refrigerant, requirements for the compound were:
Leo Krussman joined Trifari in , and Carl Fishel joined as head of sales in Trifari vintage jewelry pieces from this era are extremely rare, as the mark was only used for several years. Alfred Philippe and Trifari Vintage Jewelry In Trifari hired Alfred Philippe as head designer, and that is when the company really began to take off.
The designs he created for Trifari vintage jewelry have the style and glamour of fine jewelry and were very popular.
Jun 06, · How to Date Old Ball Mason Jars. In this Article: Article Summary Dating the Logo Locating Other Identifying Marks Knowing What Marks and Labels to Disregard Community Q&A Ball mason jars are a type of home canning jar made by the Ball Corporation. The company started making mason jars back in , and many people today still use these for canning, or collect the jars as a Views: K.
Guide Alfred Dunhill began to manufacture briar smoking pipes in ; the famous white spot first appeared on top of the hand-cut vulcanite mouthpiece in in order that the customer should know which part faced upwards. At about this same time a one year guarantee against defects was offered on the bowl of each pipe, and to insure against far older Dunhill pipes being replaced under this guarantee a simple dating code, showing the year of manufacture, was devised and stamped onto each pipe bowl.
This code is still in use today. Over the ensuing years great interest has arisen over the “mystique” of the Dunhill pipe in general and the dating code in particular. Pipe collectors, especially in America, pride themselves on having acquired Dunhill pipes in prime condition which were made in the ‘s, ‘s and ‘s. Some collectors strive to acquire only those Dunhill pipes made between when Dunhill stopped buying bowls turned in France in favor of those turned in London at the newly opened Dunhill bowl-turning facility and the year of Alfred Dunhill’s retirement.
Consequently, much confusion has arisen over the dating code because it has not been standardized over the years, and seemingly minor differences in the code can mean a difference of years, even decades, in the manufacture of the pipe. Adding to this is the fact that the firm has used a great many special stampings depending on what part of the world to which their pipes were destined, and that sometimes these stampings or codes were used for only three or four months duration.
Leading to even greater confusion is that many pipes were simply stamped incorrectly; at times one part or another of the code is not to be found on a given pipe. Taking all this into account it should not be surprising that the original and complete dating code list, in possession of the firm’s archivist at 30 Duke Street, is some twenty eight pages long. And even if this list was made available it would be of little use to any but the most expert because it can only be used in conjunction with the most precise knowledge of the Dunhill pipe as it has changed in appearance over the years.